Researchers determined that 60 tissues is the average number of tissues used dur

Question

Researchers determined that 60 tissues is the average number of tissues used during
a cold. Suppose a random sample of 100 Kleenex users yielded the following data on
the number of tissues used during a cold: Xbar (the sample mean) = 52, and s (the
sample standard deviation) = 22. Also, assume this test statistic falls in the rejection
region at a = .05. Which of the following decision is correct?

-At a = 0.05, we do not reject Ho.
-At a = 0.05, we reject Ho.
-At a = 0.05, we believe Ho.
-At a = 0.10, we do not reject Ho.

Explanation / Answer

Answer: At a = 0.05, we reject Ho. KEYWORDS: one-tailed test, mean, t test, rejection region

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