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H0 : μ = 400
H1 : μ ≠ 400
A random sample of 12 observations is selected from a normal population. The sample mean was 407 and the sample standard deviation 6. Using the .01 significance level:
a. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answers to 3 decimal places.)
Reject H0 when the test statistic is outside the interval (,).
b. Compute the value of the test statistic. (Round your answer to 3 decimal places.)
for a two tailed hypothesis test of a difference of means with icircplusmn.05 and df30 we have the following critical
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In a random sample of 26 people, the mean number of books they had read in the past year was 14.93 books and the standard deviation was 16.60 books.
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