Histogram Sample Exercises

  1. A frequency histogram

    A. requires a frequency distribution to construct the histogram
    B. cannot have bars of unequal width
    C. cannot have bars of unequal height
    D. can be used to depict the distribution of the values of a categorical variable
    E. none of the above

  2. Which one of the following statements is NOT correct about dot plots?

    A. the data values are plotted as dots along a line
    B. the center and spread of dots can easily be identified along with outliers
    C. if multiple data values are the same, we can plot them as one single dot in dot plot
    D. number of dots should be equal to the number of data values in the data set
    E. none of the above

  3. The graphs below show the number of cars sold each year by a particular car dealer. Which of the following statement is true?

    A. both plot A and B can be used in data explanation
    B. plot A and B look different due to the different vertical scales
    C. plot A and B look different due to the different horizontal scales
    D. plot B appears to show a more rapid decrease in car sales than plot A
    E. none of the above

  4. Which of the following is NOT correct about constructing histograms?

    A. all class intervals should be of equal width unless there is a good reason for groups of unequal width
    B. there should be no spaces between bars
    C. the number of classes should be reasonable
    D. classes might overlap
    E. none of the above

  5. A histogram of a data set with 1,000 observations is as follows. This distribution is

    A. right-skewed
    B. left-skewed
    C. (approximately) symmetric
    D. hard to tell
    E. none of the above

  6. Consider the following box plots of the grades in a statistics course for each gender group. Which of the following is NOT correct?

    A. about 50% of the male students get grades below 70
    B. about 50% of the male students get grades between 60 and 70
    C. about 25% of the female students get grades between 72 and 82
    D. the median grade for the female students is higher than the median grade for the male students
    E. the highest grade in female and male groups are about the same

  7. In the following stem and leaf display, the difference between the largest data value and the smallest data value (that is, the range) is

    tens        ones        
    1            1    3
    2            2    2    7
    3            
    4            1    6
    5            0    0    4    8

    A. 4
    B. 7
    C. 11
    D. 47
    E. 58

  8. Which of the following can be used to represent the distribution of the values of a categorical variable?

    A. frequency histogram
    B. pareto chart
    C. stem-and-leaf plot
    D. dot plot
    E. all of the above can be used

  9. In the following stem and leaf display, which data value occurs with the highest frequency?

    tens        ones
    1            1    3    5    6    8
    2            2    2    7
    3            9
    4            1    6
    5            0

    A. 2
    B. 22
    C. 50
    D. 18
    E. none of the above

  10. The following dot plot shows the time (in minutes) students take to get to school from home. How many students take at least 10 minutes to get to school?

    A. 1
    B. 2
    C. 4
    D. 5
    E. 6