Four alternative methods of loading a machine are tried to see whether the loading method has any effect on the likelihood that cycles will end in stoppages. The results are as follows:
Method of loading
A
B
C
D
Observed frequency of cycles with stoppages
8
4
9
3
Observed frequency of cycles without stoppages
10
16
12
18
Use the chi-squared test for frequencies to see whether these data show a significant effect of the method of loading on the probability of a stoppage. Use the 5% level of significance.
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