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1) A difference between calculating the sample mean and the population mean is

A) Only in the symbols, we use instead of μ and n instead of N

B) We divide the sum of the observations by n - 1 instead of n.

C) The observations are ranked and select the middle value for the population mean.

D) There are no differences.

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

A) Median

B) Mean

C) Mode

D) Geometric mean

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

A) Nominal

B) Ordinal

C) Interval

D) Ratio

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

A) Nominal

B) Ordinal

C) Interval

D) Ratio

5) 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

6) The weighted mean is a special case of the

A) Mean

B) Median

C) Mode

D) Geometric mean

7) The relationship between the geometric mean and the arithmetic mean is

A) They will always be the same.

B) The geometric mean will always be larger.

C) The geometric mean will be equal to or less than the mean.

D) The mean will always be larger than the geometric mean.

8) Suppose you compare the mean of raw data and the mean of the same raw data grouped into a frequency distribution. These two means will be

A) Exactly equal.

B) The same as the median.

C) The same as the geometric mean.

D) Approximately equal.

9) In a set of 10 observations the mean is 20 and the median is 15. There are 2 values that are 6, and all other values are different. What is the mode?

A) 15

B) 20

C) 6

D) None of the above.

10) Which of the measures of central tendency is the largest in a positively skewed distribution?

A) Mean

B) Median

C) Mode

D) Cannot tell from the information given.

11) Which of the following is not a measure of dispersion?

A) Range

B) Variance

C) Standard deviation

D) All of the above are measures of dispersion

12) A disadvantage of the range is

A) Only two values are used in its calculation.

B) It is in different units than the mean.

C) It does not exist for some data sets.

D) All of the above.

13) The mean deviation is

A) Based on squared deviations from the mean.

B) Also called the variance.

C) Based on absolute values.

D) Always reported in squared units.

14) The standard deviation is

A) Based on squared deviations from the mean.

B) In the same units as the mean.

C) Uses all the observations in its calculation.

D) All of the above.

15) The variance is

A) Found by dividing by N by the mean.

B) In the same units as the original data.

C) Found by squaring the standard deviation.

D) All of the above.

16) In a positively skewed distribution

A) The mean, median, and mode are all equal.

B) The mean is larger than the median.

C) The median is larger than the mean.

D) The standard deviation must be larger than the mean or the median.

17) Which of the following statements is true regarding the standard deviation?

A) It cannot assume a negative value.

B) If it is zero, then all the data values are the same.

C) It is in the same units as the mean.

D) All the above are all correct.

18) Under which of the following conditions would the standard deviation assume a negative value.

A) When all the data values were negative.

B) When more than half of the data values were negative.

C) If all the data values were the same.

D) The standard deviation cannot be negative.

19) For a stem-and-leaf display

A) Arrange the leaf values from smallest to largest.

B) Make sure the stem value is only one digit.

C) Do not allow stems with no leaf values.

D) All of the above.

20) Reference: Ref4-1

Questions 2 to 6 refer to the following information. It reports the number of TV sets sold per day at the Appliance Center.

1 11333

2 6

3 00234

4 555688999

5 1234

6 56788

7

8 8

This arrangement is called a

A) Frequency distribution

B) A frequency polygon

C) A pie chart

D) A stem-and-leaf chart

21) How many days were studied?

A) 11

B) 30

C) 50

D) None of the above

22) What was the smallest and largest number of sets sold per day?

A) 1, 8

B) 10, 80

C) 11,88

D) None of the above

23) How many days were there less than 30 sets sold?

A) 15

B) 6

C) 30

D) None of the above

24) The actual number of sets sold per day between 60 and 69 is

A) 65, 66, 67, 68, 68

B) 60, 69

C) Cannot tell from the information given

D) None of the above

25) The quartile deviation is

A) The square root of the variance.

B) Based on the middle 50 percent of the observations.

C) In squared units of the original data.

D) Appropriate only for symmetric distributions.

26) In a symmetric distribution

A) The mean, median, and mode are equal.

B) The mean is the largest measure of location.

C) The median is the largest measure of location.

D) The standard deviation is the largest value.

27) A coefficient of skewness of -2.73 was computed for a set of data. We conclude that

A) The mean is larger than the median.

B) The median is larger than the mean.

C) The standard deviation is a negative number.

D) Something is wrong because the coefficient of skewness cannot be less than -1.00.

28) A scatter diagram:

A) Is a graphic tool designed to portray the relationship between variables.

B) Uses interval or ratio scale data.

C) Does not allow negative values.

D) Both A and B are correct.

29) 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.

30) An experiment is a

A) Collection of events.

B) Collection of outcomes.

C) Always greater than 1.

D) The act of taking a measurement or the observation of some activity.

E) None of the above is correct.

Solution Description

QNT 561