b. is the same as the 25th percentile

a. contains at least one third of the data elements

c. is the same as the 50th percentile

d. is the same as the 75th percentile

Since the population is always larger than the sample, the value of the sample mean

d. could be larger, equal to, or smaller than the true value of the population mean

a. is always smaller than the true value of the population mean

b. is always larger than the true value of the population mean

c. is always equal to the true value of the population mean

The pth percentile is a value such that at least p percent of the observations are

a. less than or equal to this value

c. more than or equal to this value

If two groups of numbers have the same mean, then

d. None of these alternatives is correct.

a. their standard deviations must also be equal

b. their medians must also be equal

c. their modes must also be equal

Since the population size is always larger than the sample size, then the sample statistic

c. can be smaller, larger, or equal to the population parameter

a. can never be larger than the population parameter

b. can never be equal to the population parameter

d. can never be smaller than the population parameter

When computing the mean, the smallest value

c. can never be less than the mean

Refer to Exhibit 3-1. The number of students working 19 hours or less is

cannot be determined without the original data

Refer to Exhibit 3-1. The relative frequency of students working 9 hours or less is

cannot be determined from the information given

The variance can never be

larger than the standard deviation

smaller than the standard deviation

If a data set has an even number of observations, the median

b. is the average value of the two middle items

d. is the average value of the two middle items when all items are arranged in ascending order

The interquartile range is used as a measure of variability to overcome what difficulty of the range?

c. the range is influenced too much by extreme values

a. the sum of the range variances is zero

b. the range is difficult to compute

Descriptive Statistics: Numerical Measures

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Hard

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Descriptive Statistics: Numerical Measures

74 questions

The mean of the sample

The mean of a sample

Refer to Exhibit 3-3. The variance is

Refer to Exhibit 3-3. The standard deviation is

Refer to Exhibit 3-3. The coefficient of variation is

Refer to Exhibit 3-3. The range is

Refer to Exhibit 3-3. The interquartile range is

Refer to Exhibit 3-4. The mean is

Refer to Exhibit 3-4. The variance is

Refer to Exhibit 3-4. The standard deviation is

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