5. Thermal resistance tests on 13 samples of Enterococcus hirae, present in milk, yield the following results in degrees Celsius: 65.5, 65.8, 68.1, 67.9, 66.6, 66.2, 65.7, 67.8, 65.4, 67.5, 66.8, 65.2, 67.8. Another set of 7 samples of milk was tested after pasteurization to determine whether thermal resistance had been increased by pasteurization of milk, with the following results: 72.5, 77.1, 74.8, 73.9, 76.5, 74.3, 77.7. Assume that the two populations are normal. Find the sample variances s and s of the two samples, respectively. Find a 90% confidence interval for the ratio of variances oflo of the two (a) (b) populations. (c) Use the 0.02 level of significance to test whether it is reasonable to assume
5. Thermal resistance tests on 13 samples of Enterococcus hirae, present in milk, yield the following results in degrees Celsius: 65.5, 65.8, 68.1, 67.9, 66.6, 66.2, 65.7, 67.8, 65.4, 67.5, 66.8, 65.2, 67.8. Another set of 7 samples of milk was tested after pasteurization to determine whether thermal resistance had been increased by pasteurization of milk, with the following results: 72.5, 77.1, 74.8, 73.9, 76.5, 74.3, 77.7. Assume that the two populations are normal. Find the sample variances s and s of the two samples, respectively. Find a 90% confidence interval for the ratio of variances oflo of the two (a) (b) populations. (c) Use the 0.02 level of significance to test whether it is reasonable to assume
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Chapter1: Starting With Matlab
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Transcribed Image Text:5. Thermal resistance tests on 13 samples of Enterococcus hirae, present in milk, yield the
following results in degrees Celsius:
65.5, 65.8, 68.1, 67.9, 66.6, 66.2, 65.7, 67.8, 65.4, 67.5, 66.8, 65.2, 67.8.
Another set of 7 samples of milk was tested after pasteurization to determine whether
thermal resistance had been increased by pasteurization of milk, with the following results:
72.5, 77.1, 74.8, 73.9, 76.5, 74.3, 77.7.
Assume that the two populations are normal.
Find the sample variances s and s of the two samples, respectively.
Find a 90% confidence interval for the ratio of variances oi/o of the two
(a)
(b)
populations.
(c)
that the two samples come from populations with equal variances.
Use the 0.02 level of significance to test whether it is reasonable to assume
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