1) A numerical value used as a summary measure for a sample, such as sample mean, is known as a a

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1) A numerical value used as a summary measure for a sample, such as sample mean, is known as a

a. population parameter

b. sample parameter

c. sample statistic

d. population mean

2. The 50th percentile is the

a. mode

b. median

c. mean

d. third quartile

3. The difference between the largest and the smallest data values is the

a. variance

b. interquartile range

c. range

d. coefficient of variation

4. When data are positively skewed, the mean will usually be

a. greater than the median

b. smaller than the median

c. equal to the median

d. positive

5. The numerical value of the standard deviation can never be

a. larger than the variance

b. zero

c. negative

d. smaller than the variance