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Find out the test of significance of chi-square attributes.
At a large commercial bakery, one of the measures used to evaluate employees is number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and the broken cookie rate. Assume the job is repetitious, so after training, any improvement due to continued learning is likely offset by decreased motivation.
The broken cookie rates are calculated daily. The results for 100 workers are given below:
Years Since Training Period
<1 Year
1-4 Years
>4 Years
Group 1
Group 2
Group 3
Total
Broken Cookie Rate
High
6
9
24
Average
19
23
51
Low
7
8
10
25
22
36
42
100
Properly test the null hypothesis using the chi-squared method with α=0.05.
What is your decision?
1. Reject the null hypothesis of equal broken cookie rates.
2. Fail to reject the null hypothesis of equal broken cookie rates.
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