Question 1 of 20

5.0 Points

When TV advertisements report that “2 out of 3 dentists surveyed indicated they would recommend Brand X toothpaste to their patients,” an informed consumer may question the conclusion because:

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A. the results were incorrectly computed.

B. dentists were not really surveyed.

C. the conclusion does not include the total number of dentists surveyed.

D. the conclusion is not illustrated with a graph. Reset Selection

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Question 2 of 20

5.0 Points

The main purpose of descriptive statistics is to:

A. summarize data in a useful and informative manner.

B. make inferences about a population.

C. determine if the data adequately represents the population.

D. gather or collect data. Reset Selection

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Question 3 of 20

5.0 Points

A poll of 1,000 voters used to predict the outcome of a statewide election is an example of:

A. descriptive statistics.

B. continuous variable measurement.

C. statistical inference.

D. deductive statistics. Reset Selection

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Question 4 of 20

5.0 Points

The number of fishing boats shipped from a manufacturer to a dealer each month is described as a:

A. random variable.

B. qualitative variable.

C. discrete variable.

D. continuous variable. Reset Selection

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Question 5 of 20

5.0 Points

The kinds of numbers that can take on any value, either a fraction or integer, between specified limits are called:

A. random variables.

B. qualitative variables.

C. discrete variables.

D. continuous variables. Reset Selection

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Question 6 of 20

5.0 Points

Which of the following is an example of a qualitative variable?

A. Number of children in a family

B. Weight of a person

C. Color of ink in a pen

D. Miles between oil changes Reset Selection

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Question 7 of 20

5.0 Points

Data obtained on the preferences of different religious groups for specific types of network television programming is an example of:

A. random variables.

B. qualitative variables.

C. discrete variables.

D. continuous variables. Reset Selection

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Question 8 of 20

5.0 Points

__________ level data are mutually exclusive and exhaustive, and categories are scaled according to the amount of the characteristic they possess, and zero represents a point on the scale.

A. Nominal

B. Ordinal

C. Interval

D. Ratio Reset Selection

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Question 9 of 20

5.0 Points

A bank asks customers to evaluate the drive-through service as good, average, or poor. Which level of measurement does this classification illustrate?

A. Nominal

B. Ordinal

C. Interval

D. Ratio Reset Selection

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Question 10 of 20

5.0 Points

Information can be misrepresented:

A. through misleading charts and graphs.

B. by reporting of an association of variables as causation.

C. by presenting average data that misrepresents sample or population data.

D. All of the above Reset Selection

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Question 11 of 20

5.0 Points

The _________ level of measurement presumes that one classification is ranked higher than another.

A. nominal

B. ordinal

C. interval

D. ratio Reset Selection

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Question 12 of 20

5.0 Points

_________ data are usually summarized in graphs and bar charts.

A. Qualitative

B. Quantitative

C. Continuous

D. Discrete Reset Selection

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Question 13 of 20

5.0 Points

Data can be classified according to:

A. discrete variables.

B. continuous variables.

C. attributes.

D. levels of measurement. Reset Selection

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Question 14 of 20

5.0 Points

A _________ is the total collection of individuals or objects.

A. data set

B. sample

C. population

D. grouping Reset Selection

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Question 15 of 20

5.0 Points

An example of the _________ level of measurement is temperature.

A. nominal

B. ordinal

C. interval

D. ratio Reset Selection

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Question 16 of 20

5.0 Points

With the _________ level of measurement, the data are sorted into categories with no particular order to the categories.

A. nominal

B. ordinal

C. interval

D. ratio Reset Selection

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Question 17 of 20

5.0 Points

The _________ level is the “highest” level of measurement.

A. nominal

B. ordinal

C. interval

D. ratio Reset Selection

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Question 18 of 20

5.0 Points

Another term for an attribute is a _________ variable.

A. discrete

B. continuous

C. qualitative

D. quantitative Reset Selection

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Question 19 of 20

5.0 Points

_________ involve(s) making estimates about a population based on sample results.

A. Inferential statistics

B. Determinant statistics

C. Statistical sampling

D. Statistical analysis Reset Selection

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Question 20 of 20

5.0 Points

With _________ level data, the data classifications are scaled according to the amount of the characteristic they possess.

A. nominal

B. ordinal

C. interval

D. ratio

2

Question 1 of 20

5.0 Points

A student was interested in the cigarette smoking habits of college students and collected data from an unbiased random sample of students. The data is summarized in the following table:

Males Surveyed 50 Females Surveyed 75

Males Who Smoke 20 Females Who Smoke 25

Males Who Do Not Smoke 30 Females Who Do Not Smoke 50

Why is the table NOT a frequency distribution?

A. The number of males does not equal the sum of males that smoke and do not smoke.

B. The classes are not mutually exclusive.

C. There are too many classes.

D. Class limits cannot be computed. Reset Selection

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Question 2 of 20

5.0 Points

The main purpose of descriptive statistics is to:

A. data in a useful and informative manner.

B. make inferences about a population.

C. determine if the data adequately represents the population.

D. gather or collect data. Reset Selection

Mark for Review What’s This?

Question 3 of 20

5.0 Points

A poll of 1,000 voters used to predict the outcome of a statewide election is an example of:

A. descriptive statistics.

B. continuous variable measurement.

C. statistical inference.

D. deductive statistics. Reset Selection

Mark for Review What’s This?

Question 4 of 20

5.0 Points

The number of fishing boats shipped from a manufacturer to a dealer each month is described as a:

A. random variable.

B. qualitative variable.

C. discrete variable.

D. continuous variable. Reset Selection

Mark for Review What’s This?

Question 5 of 20

5.0 Points

The kinds of numbers that can take on any value, either a fraction or integer, between specified limits are called:

A. random variables.

B. qualitative variables.

C. discrete variables.

D. continuous variables. Reset Selection

Mark for Review What’s This?

Question 6 of 20

5.0 Points

Which of the following is an example of a qualitative variable?

A. Number of children in a family

B. Weight of a person

C. Color of ink in a pen

D. Miles between oil changes Reset Selection

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Question 7 of 20

5.0 Points

Data obtained on the preferences of different religious groups for specific types of network television programming is an example of:

A. random variables.

B. qualitative variables.

C. discrete variables.

D. continuous variables. Reset Selection

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Question 8 of 20

5.0 Points

__________ level data are mutually exclusive and exhaustive, and categories are scaled according to the amount of the characteristic they possess, and zero represents a point on the scale.

A. Nominal

B. Ordinal

C. Interval

D. Ratio Reset Selection

Mark for Review What’s This?

Question 9 of 20

5.0 Points

A bank asks customers to evaluate the drive-through service as good, average, or poor. Which level of measurement does this classification illustrate?

A. Nominal

B. Ordinal

C. Interval

D. Ratio Reset Selection

Mark for Review What’s This?

Question 10 of 20

5.0 Points

Information can be misrepresented:

A. through misleading charts and graphs.

B. by reporting of an association of variables as causation.

C. by presenting average data that misrepresents sample or population data.

D. All of the above Reset Selection

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Question 11 of 20

5.0 Points

The first procedure we use to describe a data set is:

A. differentiation.

B. classification.

C. data correlation.

D. frequency distribution. Reset Selection

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Question 12 of 20

5.0 Points

The number of observations in each class is called the:

A. data set

B. class size

C. class frequency

D. class interval Reset Selection

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Question 13 of 20

5.0 Points

Which of the following is not a step used to organize data into a frequency distribution?

A. decide on the number of classes.

B. determine the class interval.

C. prepare the raw data.

D. set the individual class limits. Reset Selection

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Question 14 of 20

5.0 Points

The _________ can be computed by adding the lower class limit to the upper class limit and dividing by 2.

A. class midpoint

B. class interval

C. class mark

D. class size Reset Selection

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Question 15 of 20

5.0 Points

A set of data consists of 38 observations. How many classes would you recommend for the frequency distribution?

A. 4

B. 5

C. 6

D. 8 Reset Selection

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Question 16 of 20

5.0 Points

A _________ is especially useful for depicting nominal level data.

A. bar chart

B. line chart

C. histogram

D. pie chart Reset Selection

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Question 17 of 20

5.0 Points

A set of data consists of 230 observations between $235 and $567. What class interval would you recommend?

A. 15

B. 25

C. 45

D. 50 Reset Selection

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Question 18 of 20

5.0 Points

Both the _________ and the _________ allow us to get a quick picture of the main characteristics of the data.

A. frequency distribution chart, polygraph

B. histogram, frequency polygon

C. pie chart, line chart

D. horizontal bar chart, vertical bar chart Reset Selection

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Question 19 of 20

5.0 Points

A set of data consists of 83 observations. How many classes would you recommend for the frequency distribution?

A. 5

B. 6

C. 7

D. 8 Reset Selection

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Question 20 of 20

5.0 Points

A stem-and-leaf display is an alternative to a:

A. histogram

B. frequency distribution

C. frequency polygon

D. horizontal bar chart

3

uestion 1 of 20

5.0 Points

A quality control officer samples the number of adjustments on 10 machines over the course of a week in order to estimate the total number of adjustments on all machines in a factory. This is an example of a(n):

A. population mean.

B. sample mean.

C. arithmetic mean.

D. weighted mean. Reset Selection

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Question 2 of 20

5.0 Points

A clerk records the number of daily responses to a mail survey in one week. The response totals were 7, 17, 22, 12, 23, 20, more than 25. What is the arithmetic mean of the data set?

A. 14.43

B. 16.83

C. 18

D. Not calculable with the given data set. Reset Selection

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Question 3 of 20

5.0 Points

What is the mean weight of a sample of largemouth bass caught in a lake with weights of 2 lbs., 2 lbs., 3 lbs., 6 lbs., 8 lbs, and 8 lbs.?

A. 3.17 lbs.

B. 4.75 lbs.

C. 4.83 lbs.

D. Not calculable with the given data set Reset Selection

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Question 4 of 20

5.0 Points

The arithmetic mean:

A. is a unique number for any data set.

B. is always the most representative measure of central tendency for any given data set.

C. is the only measure of location where the sum of the deviations of each value from the mean will always be zero.

D. Both A and C Reset Selection

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Question 5 of 20

5.0 Points

Merchandise inventory purchases for a firm for a three-month period are: January: 2,000 units @ $12 per unit; February: 1,800 @ $14 per unit; March 2,600 units @ 15 per unit. What is the mean unit cost of merchandise inventory?

A. $12.82

B. $13.33

C. $13.78

D. $14.00 Reset Selection

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Question 6 of 20

5.0 Points

One advantage of the median as a measure of central tendency is:

A. the possibility of more than one median existing for a given data set.

B. its usefulness for comparing two or more data sets.

C. its usefulness for describing nominal data sets.

D. that it is not affected by extreme values in the data set. Reset Selection

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Question 7 of 20

5.0 Points

The median:

A. usually appears twice in a data set.

B. cannot be computed from a frequency distribution.

C. can be computed for all levels of data.

D. is the midpoint of values in a distribution that is ordered from the smallest to the largest. Reset Selection

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Question 8 of 20

5.0 Points

From the data set 14, 16, 17, 18, 20, what is the mode?

A. 16.5

B. 17

C. 5

D. There is no mode for this data set. Reset Selection

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Question 9 of 20

5.0 Points

To measure the average percentage population increase in a state over a census period, a statistician should use the:

A. geometric mean.

B. arithmetic mean.

C. harmonic mean.

D. median. Reset Selection

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Question 10 of 20

5.0 Points

What is the geometric mean of the following sequence? 8, 8, 12, 14, 22, 16, 20

A. 13.35

B. 14

C. 14.5

D. 16 Reset Selection

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Question 11 of 20

5.0 Points

Please answer questions 11-13 using the following data.

Sales Number of Retailers

100 up to 120 5

120 up to 140 7

140 up to 160 9

160 up to 180 16

180 up to 200 10

200 up to 220 3

What is the mean sales level?

A. 160

B. 160.7

C. 161.20

D. 170 Reset Selection

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Question 12 of 20

5.0 Points

Based on the information in the chart in #11 (above), what is the median sales level?

A. 155

B. 165

C. 168

D. 170 Reset Selection

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Question 13 of 20

5.0 Points

Based on the information in the chart in #11 (above), what is the modal observation?

A. 150

B. 160

C. 170

D. 180 Reset Selection

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Question 14 of 20

5.0 Points

The mean of a data set is 42, the mode is 36, and the median value is 40. The data set is:

A. positively skewed.

B. negatively skewed.

C. a symmetrical distribution.

D. No determination on the skewness of the data set can be made without additional information. Reset Selection

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Question 15 of 20

5.0 Points

Sometimes, data has two values that have the highest and equal frequencies. In this case, the distribution of the data can best be summarized as:

A. symmetrical.

B. bimodal (having two modes).

C. positively skewed.

D. negatively skewed. Reset Selection

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Question 16 of 20

5.0 Points

What is the relationship between the mean and median in a negatively skewed distribution?

A. The mean is less than the median.

B. The median is less than the mean.

C. The geometric mean is higher than the median.

D. They are symmetrical with respect to one another. Reset Selection

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Question 17 of 20

5.0 Points

A distribution that has the same shape on either side of the center is said to be:

A. positively skewed.

B. negatively skewed.

C. symmetrical.

D. central. Reset Selection

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Question 18 of 20

5.0 Points

What is the relationship among the mean, median, and mode in a symmetric distribution?

A. They are all equal.

B. The mean is always the smallest value.

C. The median is always the largest value.

D. The mode is always the largest value. Reset Selection

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Question 19 of 20

5.0 Points

A negatively skewed distribution indicates that:

A. the distribution is not symmetrical.

B. the long tail is to the right.

C. the long tail is to the left.

D. Both A and C Reset Selection

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Question 20 of 20

5.0 Points

The weekly sales from a sample of ten computer stores yielded a mean of $25,900; a median $25,000 and a mode of $24,500. What is the shape of the distribution?

A. Symmetrical

B. Positively skewed

C. Negatively skewed

D. Bi-modal

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