Question
(1 point) It is necessary for an automobile producer to estimate the number of miles per gallon achieved by its cars. Suppose that the sample
(1 point) 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 of140
140cars is28.3
28.3miles and assume the standard deviation is4
4miles. Now suppose the car producer wants to test the hypothesis that?
?, the mean number of miles per gallon, is26
26against the alternative hypothesis that it is not26
26. Conduct a test using?=.05
?=.05by giving the following:
(a)
positive criticalz
zscore
(b)
negative criticalz
zscore
(c)
test statistic
The final conclustion is
A.We can reject the null hypothesis that?=26
?=26and accept that??26
??26.
B.There is not sufficient evidence to reject the null hypothesis that?=26
?=26.
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