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2.5.5 Hypothesis test for the mean of a normal distribution (A-level only)

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Question 28

The response times of two distinct cloud-based microservices, Alpha and Beta, were recorded under peak load conditions. A random sample of 80 requests to Service Alpha resulted in a mean response time of 242 ms with a standard deviation of 32 ms. A separate random sample of 120 requests to Service Beta resulted in a mean response time of 251 ms with a standard deviation of 45 ms.

a.

Test, at the 1% significance level, whether there is evidence that the mean response time of Service Alpha is less than the mean response time of Service Beta. State your hypotheses clearly.

[5]
b.

State two assumptions required for the validity of the test in part (a).

[2]

2.5.5 Hypothesis test for the mean of a normal distribution (A-level only) Questions

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