Question: 7.49 It is desired to test the null hypothesis = 30 minutes against the alternative hypothesis < 30 minutes on the basis of

7.49 It is desired to test the null hypothesis μ = 30 minutes against the alternative hypothesis μ < 30 minutes on the basis of the time taken by a newly developed oven for n = 50 cakes baked. The population has σ = 5 minutes. For what values of X must the null hypothesis be rejected if the probability of a Type I error is to be α = 0.05.

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