It is necessary for an automobile producer to estimate the number of miles per gallon achieved by its cars. Suppose that the sample mean for a random sample of 120 cars is 28.3 miles and assume the standard deviation is 2.3 miles. Now suppose the car producer wants to test the hypothesis that μ, the mean number of miles per gallon, is 28.4 against the alternative hypothesis that it is not 28.4 Conduct a test using α=.05 by giving the following: (a) positive critical z score? (b) negative critical z score? (c) test statistic? The final conclustion is A. We can reject the null hypothesis that μ=28.4 and accept that μ≠28.4 B. There is not sufficient evidence to reject the null hypothesis that μ=28.4
It is necessary for an automobile producer to estimate the number of miles per gallon achieved by its cars. Suppose that the sample mean for a random sample of 120 cars is 28.3 miles and assume the standard deviation is 2.3 miles. Now suppose the car producer wants to test the hypothesis that μ, the mean number of miles per gallon, is 28.4 against the alternative hypothesis that it is not 28.4 Conduct a test using α=.05 by giving the following:
(a) positive critical z score?
(b) negative critical z score?
(c) test statistic?
The final conclustion is
A. We can reject the null hypothesis that μ=28.4 and accept that μ≠28.4
B. There is not sufficient evidence to reject the null hypothesis that μ=28.4
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