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1) Which of the following...

1) Which of the following measures of central location is affected most by extreme values?

A. Mean

B. Median

C. Mode

D. Geometric mean

2) Which level of measurement is required for the median?

A. Nominal

B. Ordinal

C. Interval

D. Ratio

3) Which level of measurement is required for the mode?

A. Nominal

B. Ordinal

C. Interval

D. Ratio

4) In a set of observations, which measure of central tendency reports the value that occurs most often?

A. Mean

B. Median

C. Mode

D. Geometric mean

5) The weighted mean is a special case of what?

A. Mean

B. Median

C. Mode

D. Geometric mean

6) A sample of 5 companies were examined for changes in their relative market share. The results showed the following increases and decreases: –5, 10, 10, 5, –10. Select the response which represents the calculated mean of these results.

A. 8

B. 2

C. -2

D. 6

7) The difference between the sample mean and the population mean is called the

A. margin of error

B. population standard deviation

C. standard error of the mean

D. sampling error

8) A local trade union consists of plumbers and electricians. Classified according to rank:

Apprentice Journeyman Master Total

Plumbers 25 20 30 75

Electricians 15 40 20 75

40 60 50 150

What is the probability that a randomly selected electrician is a master?

A. .053

B. .133

C. .500

D. .267

9) Suppose a population consisted of 20 items. How many different samples of n = 3 are possible?

A. 6840

B. 1140

C. 20

D. 120

10) The mean and the variance are equal in

A. the normal distribution

B. the binomial distribution

C. the Poisson distribution

D. the hypergeometric distribution

11) In the 1936 presidential election Franklin D. Roosevelt defeated Alfred E. Landon in a landslide vote. A Landon victory had been predicted by the Literary Digest, a magazine that ran the oldest, largest, and most widely publicized of the polls at the time. The Literary Digest's final prediction was based on 10 million sample ballots mailed to prospective voters, and 2.3 million were returned. The sample of voters was drawn from lists of automobile and telephone owners. Despite the massive size of this sample, it failed to predict a Roosevelt victory, being off the mark by 19 percentage points. The Literary Digest was wrong because

A. the sample size, although large, was not large enough

B. the right research questions were not asked

C. respondents intentionally lied about their preferred candidate

D. the sample used was not representative of the actual population at the time

12) In a study on the effect of reinforcement on learning from a company online training program, two experimental treatments are planned: reinforcement given after every learning module, or reinforcement given after every two learning modules. Reinforcement is accomplished with the addition of more examples. Which one of the following control groups would serve best in this study?

A. A group that does not read any of the learning modules.

B. A group that reads the modules using hardcopy only.

C. A group that reads the learning modules, but does not receive reinforcement.

D. A group that reads the learning modules with random reinforcement.

13) The central limit theorem is important to market researchers because it states that as sample sizes increase, the distribution of the sample ________ collected from consumers on any topic of interest being researched approaches the normal distribution.

A. medians

B. means

C. standard deviations

D. variances

14) To find confidence intervals for the mean of a normal distribution, the t distribution is usually used in practical applications instead of the standard normal distribution because

A. the mean of the population is not known

B. the t distribution is more effective

C. the variance of the population is usually not known

D. the sample size is not known

15) We wish to develop a confidence interval for the population mean. The population follows the normal distribution, the standard deviation of the population is 3, and we have a sample of 10 observations. We decide to use the 90% level of confidence. The appropriate value of to represent the level of confidence is

A. z = 1.65

B. z = 1.96

C. z = 1.833

D. z = 1.812

16) Which of the following is a correct statement about a probability?

A. It may range from 0 to 1.

B. It may assume negative values.

C. It may be greater than 1.

D. It cannot be reported to more than 1 decimal place.

17) The special rule of addition is used to combine

A. independent events

B. mutually exclusive events

C. events that total more than one

D. events based on subjective probabilities

A. Mean

B. Median

C. Mode

D. Geometric mean

2) Which level of measurement is required for the median?

A. Nominal

B. Ordinal

C. Interval

D. Ratio

3) Which level of measurement is required for the mode?

A. Nominal

B. Ordinal

C. Interval

D. Ratio

4) In a set of observations, which measure of central tendency reports the value that occurs most often?

A. Mean

B. Median

C. Mode

D. Geometric mean

5) The weighted mean is a special case of what?

A. Mean

B. Median

C. Mode

D. Geometric mean

6) A sample of 5 companies were examined for changes in their relative market share. The results showed the following increases and decreases: –5, 10, 10, 5, –10. Select the response which represents the calculated mean of these results.

A. 8

B. 2

C. -2

D. 6

7) The difference between the sample mean and the population mean is called the

A. margin of error

B. population standard deviation

C. standard error of the mean

D. sampling error

8) A local trade union consists of plumbers and electricians. Classified according to rank:

Apprentice Journeyman Master Total

Plumbers 25 20 30 75

Electricians 15 40 20 75

40 60 50 150

What is the probability that a randomly selected electrician is a master?

A. .053

B. .133

C. .500

D. .267

9) Suppose a population consisted of 20 items. How many different samples of n = 3 are possible?

A. 6840

B. 1140

C. 20

D. 120

10) The mean and the variance are equal in

A. the normal distribution

B. the binomial distribution

C. the Poisson distribution

D. the hypergeometric distribution

11) In the 1936 presidential election Franklin D. Roosevelt defeated Alfred E. Landon in a landslide vote. A Landon victory had been predicted by the Literary Digest, a magazine that ran the oldest, largest, and most widely publicized of the polls at the time. The Literary Digest's final prediction was based on 10 million sample ballots mailed to prospective voters, and 2.3 million were returned. The sample of voters was drawn from lists of automobile and telephone owners. Despite the massive size of this sample, it failed to predict a Roosevelt victory, being off the mark by 19 percentage points. The Literary Digest was wrong because

A. the sample size, although large, was not large enough

B. the right research questions were not asked

C. respondents intentionally lied about their preferred candidate

D. the sample used was not representative of the actual population at the time

12) In a study on the effect of reinforcement on learning from a company online training program, two experimental treatments are planned: reinforcement given after every learning module, or reinforcement given after every two learning modules. Reinforcement is accomplished with the addition of more examples. Which one of the following control groups would serve best in this study?

A. A group that does not read any of the learning modules.

B. A group that reads the modules using hardcopy only.

C. A group that reads the learning modules, but does not receive reinforcement.

D. A group that reads the learning modules with random reinforcement.

13) The central limit theorem is important to market researchers because it states that as sample sizes increase, the distribution of the sample ________ collected from consumers on any topic of interest being researched approaches the normal distribution.

A. medians

B. means

C. standard deviations

D. variances

14) To find confidence intervals for the mean of a normal distribution, the t distribution is usually used in practical applications instead of the standard normal distribution because

A. the mean of the population is not known

B. the t distribution is more effective

C. the variance of the population is usually not known

D. the sample size is not known

15) We wish to develop a confidence interval for the population mean. The population follows the normal distribution, the standard deviation of the population is 3, and we have a sample of 10 observations. We decide to use the 90% level of confidence. The appropriate value of to represent the level of confidence is

A. z = 1.65

B. z = 1.96

C. z = 1.833

D. z = 1.812

16) Which of the following is a correct statement about a probability?

A. It may range from 0 to 1.

B. It may assume negative values.

C. It may be greater than 1.

D. It cannot be reported to more than 1 decimal place.

17) The special rule of addition is used to combine

A. independent events

B. mutually exclusive events

C. events that total more than one

D. events based on subjective probabilities

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