Problem 3: Are students in one grade level tend to be absent more than others? The Attendance Office selected a random week out of the 40 school weeks and tally the number of absences for each grade level. The table below shows the results. Freshmen Sophomore Junior Senior Total 35 39 46 52 172 a) If the proportion of the absence is equally shared by each grade level, then how many absences do you expect to see for each grade level? Explain. b) Do we have some evidence to suggest that one grade level tends to be absent more than the others? Explain. Is this statistically significant? c) Find the Critical x? value for this problem. Use alpha value = 0.10 and df = 3 (because 4 categories minus 1). %3D

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Chapter1: Combinatorial Analysis
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Can I get some help on problem 3 A-C

Problem 3: Are students in one grade level tend to be absent more than others? The
Attendance Office selected a random week out of the 40 school weeks and tally the number of
absences for each grade level. The table below shows the results.
Freshmen Sophomore Junior
Senior
Total
35
39
46
52
172
a) If the proportion of the absence is equally shared by each grade level, then how many
absences do you expect to see for each grade level? Explain.
b) Do we have some evidence to suggest that one grade level tends to be absent more than the
others? Explain. Is this statistically significant?
c) Find the Critical x? value for this problem. Use alpha value = 0.10 and df = 3 (because 4
categories minus 1).
Transcribed Image Text:Problem 3: Are students in one grade level tend to be absent more than others? The Attendance Office selected a random week out of the 40 school weeks and tally the number of absences for each grade level. The table below shows the results. Freshmen Sophomore Junior Senior Total 35 39 46 52 172 a) If the proportion of the absence is equally shared by each grade level, then how many absences do you expect to see for each grade level? Explain. b) Do we have some evidence to suggest that one grade level tends to be absent more than the others? Explain. Is this statistically significant? c) Find the Critical x? value for this problem. Use alpha value = 0.10 and df = 3 (because 4 categories minus 1).
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