26. A possible problem with open-ended or unequal intervals is that they

A.do not permit the computation of midpoints.

B.are useful only for nominal-level variables.

C.can be used only with variables that have few scores.

D.cannot be used for interval-ratio level variables.

27.A researcher wants to visually display the U.S. divorce rate (a continuous, interval-ratio level variable) for the last 50 years. An appropriate format would be

A.a line chart or histogram.

B.only a histogram would work in this situation.

C.a pie chart.

D.none of the above. Data in the form of rate should never be displayed in a chart or graph.

28. An instructor is preparing a report showing mid-semester grades and notes that the mean, median, and mode are all exactly 76.00. What can she conclude?

A.The distribution of grades is unskewed.

B.There is a negative skew in the distribution (a few students have very low grades.)

C.There is a positive skew in the distribution (a few students have very high grades.)

D.All of the above

29. Deciles, quartiles, and percentiles divide a distribution of scores into, respectively,

A.ones, twos, and threes.

B.fourths, fifths, and thirds.

C.tens, twenties, and forties.

D.tens, quarters, and hundredths

30. Cumulative frequencies and cumulative percentages allow a researcher to

A.be sure the column totals are correct.

B.tell at a glance how many cases fall above or below a given category.

C.show the accuracy of his or her findings.

D.All of the above