BADM Quiz 4 The mean and Standard Deviation Multiple Choice

The sum of deviations of the individual data elements from their mean is _____. Select one: a.always equal to zero b.sometimes greater than and sometimes less than zero, depending on the data elements c.always less than zero d.always greater than zero

a. always equal to zero

The value of the sum of the squared deviations from the mean, i.e., E(x-xbar)^2 must always be _____. Select one: a.at least zero b.less than the mean c.either positive or negative, depending on whether the mean is negative or positive d.negative

a. at least zero

Which of the following is a measure of dispersion? Select one: a.interquartile range b.percentiles c.All of the answers are correct. d.quartiles

a. interquartile range

Which of the following symbols represents the size of a sample? Select one: a.n b.σ2 c.σ d.N

a. n

The 75th percentile is also the _____. Select one: a.third quartile b.second quartile c.fourth quartile d.first quartile

a. third quartile

Which of the following is NOT a measure of variability of a single variable? Select one: a.range b.covariance c.standard deviation d.coefficient of variation

b. covariance

The most frequently occurring value of a data set is called the _____. Select one: a.None of the answers is correct. b.mode c.mean d.range

b. mode

The median of a sample will always equal the _____. Select one: a.mode b.mean c.50th percentile d.All of the answers are correct.

c. 50th percentile

Since the median is the middle value of a data set, it must always be _____. Select one: a.smaller than the mean b.larger than the mode c.None of the answers is correct. d.smaller than the mode

c. None of these answers is correct.

In statistics, what does IQR mean? Select one: a.individual quantity range b.inter-quantity relativity c.inter-quartile range d.individual quartile relativity

c. inter-quartile range

The 50th percentile is the _____. Select one: a.mean b.mode c.median d.third quartile

c. median

Which of the following is NOT a measure of location? Select one: a.mean b.mode c.variance d.median

c. variance

The measure of location most likely to be influenced by extreme values in the data set is the _____. Select one: a.median b.mode c.range d.mean

d. mean

The measure of variability easiest to compute, but seldom used as the only measure, is the _____. Select one: a.interquartile range b.standard deviation c.variance d.range

d. range