Question

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

1. do not permit the computation of midpoints.
2. are useful only for nominal-level variables.
3. can be used only with variables that have few scores.
4. 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

1. a line chart or histogram.
2. only a histogram would work in this situation.
3. a pie chart.
4. 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?

1. The distribution of grades is unskewed.
2. There is a negative skew in the distribution (a few students have very low grades.)
3. There is a positive skew in the distribution (a few students have very high grades.)
4. All of the above

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

1. ones, twos, and threes.
2. fourths, fifths, and thirds.
3. tens, twenties, and forties.
4. tens, quarters, and hundredths

30. Cumulative frequencies and cumulative percentages allow a researcher to

1. be sure the column totals are correct.
2. tell at a glance how many cases fall above or below a given category.
3. show the accuracy of his or her findings.
4. All of the above

Answer 1

26) A.do not permit the computation of midpoints.

27) A. a line chart or histogram.

28) A.The distribution of grades is unskewed

29) D. tens, quarters, and hundredths

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