QUESTION 1: To identify the point in a distribution at which 50% of scores fall above and 50% fall below a given score, which measure of central tendency would you report?

a. average
b. mean
c. mode
d. median

QUESTION 2: Which of the following requires you to multiply a set of scores by the frequency of their occurrence, add the total of these products, and divide by the total number of scores?

a. geometric mean
b. arithmetic mean
c. weighted mean
d. harmonic mean

QUESTION 3: Which measure of central tendency is greatly influenced by extreme data values?

a. median
b. all of the above
c. mode
d. mean

QUESTION 4: Which measure of central tendency is best for describing qualitative data?

a. the weighted mean
b. mean
c. median
d. mode

QUESTION 5: Variability is a measure of how much each score in a group of scores differs from the what?

a. mode
b. median
c. mean
d. variability

QUESTION 6: If a distribution is "significantly distorted" what is this called?

a. variability
b. skew
c. percentile
d. putliers

QUESTION 7: When calculating the standard deviation, what must be done in order to obtain an unbiased estimate of the population?

a. add 1 to n
b. subtract 1 from X
c. subtract 1 from N
d. subtract 1 from n

QUESTION 8: Which of the following sets of scores has the most variability?

a. 7,7,8,8,10,11
b. 7,10,11,15,19
c. 6,6,7,7,7,7,7

QUESTION 9: Which of the following is the correct function for calculating an unbiased estimate of the variance in the population?

a. STDEV(A1:A10)
b. STDEV(A1+A2+A3)/3
c. VAR(A1:A12)
d. AVERAGE(A1:A15)

QUESTION 10: If you intend to use a sample as an estimate of a population parameter, which standard deviation is the best to calculate?

a. mean deviation
b. squared deviation
c. unbiased
d. biased