
Wristwatch Accuracy Students of the author collected a simple random sample of times (see) of wristwatch errors, and a few of those times are listed below. Negative values correspond to watches that are running ahead of the actual time. Assuming that we want to use a 0.05 significance level to test the claim that the sample is from a population with a
140 −85 325 20 305 205 20 −93

To identify: The null hypothesis and alternative hypothesis.
Answer to Problem 1CQQ
The null hypothesis is
The alternative hypothesis is
Explanation of Solution
Given info:
The test of the claim is that the population with mean time of the wristwatches equal to 0 sec. and significance level is 0.05.
Calculation:
Here, the test is to claim the population with mean time of the wristwatches is equal to 0 sec. represents the null hypothesis. Thus, the alternative hypothesis is the population with mean time of the wristwatches is not equal to 0 sec.
The null and alternative hypotheses are given below:
Null hypothesis:
That is, there is no evidence to reject the claim that the population with mean equal to 0 sec.
Alternative hypothesis:
That is, there is evidence to reject the claim that the population with mean not equal to 0 sec.
Thus, the null hypothesis is
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Chapter 8 Solutions
Elementary Statistics with Student Access Kit
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