Question

I need help answering the questions below. Please help :)

Graph the frequency distribution as a histogram graph.

Carry all calculations and the answer to 4 decimal places unless otherwise noted. For example, the number "123.0000" has been carried and reported to 4 decimal places. (Yes, trailing zeros count.)

The Countrytown School District has recorded the number of absences in a school year for a random sample of 24 students. The school board is concerned that half of their students may be missing two weeks or more of school attendance.

Number of absences from a random sample of 24 students

2          5          5          7          8          8

9          9          11        11        11

13        13        14        14        14        14

15        15        15        16        17        18        19

1. How many classes will the Frequency Distribution Table have for this data set?
2. What is the Class Width for each class?
3. When drawing the frequency polygon, what is the lower x-intercept?
4. When drawing the frequency polygon, what is the upper x-intercept?
5. What is the mean (arithmetic average) for this data set? (round your answer to 4 decimal places).
6. What is the median for this data set? (report your answer to 4 decimal places)
7. What is the midpoint of the modal class for this data set? (report your answer to 4 decimal places).
8. What is the relative frequency of the modal class for this data set? (report your answer to 4 decimal places)
9. What is the standard deviation for this data set? (round your answer to 4 decimal places)
10. What is the Coefficient Of Variation for this data set? (Note: COV is a % reported to 2 decimal places, like "12.34%" so remember to use the % sign after the numerical answer.)
11. Viewing the graph of the histogram, how would you correctly describe this distribution?
12. Which measure of central tendency should be used to interpret this data set?
13. Refer to your answer in Question # 12. Why is the correct choice for the measure of central tendency in Question # 12 the preferred choice?
14. Regarding the practical application of these statistical results, do you think that the school board should be worried about excessive absences according to their concerns?
15. To study whether the number of absences is increasing, decreasing, or remaining about the same when comparing consecutive school years, what type of study should the Superintendent of Schools design?

Answer 1

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