Chapter 8: Q. 9.41 (page 364)
Determine the critical value(s) for a one-mean z-test. For each exercise, draw a graph that illustrates your answer.
A two-tailed test with
Short Answer
The graph drawn is

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Chapter 8: Q. 9.41 (page 364)
Determine the critical value(s) for a one-mean z-test. For each exercise, draw a graph that illustrates your answer.
A two-tailed test with
The graph drawn is

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Final Conclusions. In Exercises 25鈥28, use a significance level of = 0.05 and use the given information for the following:
a. State a conclusion about the null hypothesis. (Reject or fail to reject .)
b. Without using technical terms or symbols, state a final conclusion that addresses the original claim.
Original claim: The standard deviation of pulse rates of adult males is more than 11 bpm. The hypothesis test results in a P-value of 0.3045.
In Exercises 1鈥4, use these results from a USA Today survey in which 510 people chose to respond to this question that was posted on the USA Today website: 鈥淪hould Americans replace passwords with biometric security (fingerprints, etc)?鈥 Among the respondents, 53% said 鈥測es.鈥 We want to test the claim that more than half of the population believes that passwords should be replaced with biometric security.
Null and Alternative Hypotheses Identify the null hypothesis and alternative hypothesis.
Finding P-values. In Exercises 5鈥8, either use technology to find the P-value or use Table A-3 to find a range of values for the P-value.
8. Tornadoes. The claim is that for the widths (yd) of tornadoes, the mean is yd. The sample size is n = 21 and the test statistic is t = -0.024.
Critical Values. In Exercises 21鈥24, refer to the information in the given exercise and do the following.
a. Find the critical value(s).
b. Using a significance level of = 0.05, should we reject or should we fail to reject ?
Exercise 18
Testing Claims About Proportions. In Exercises 9鈥32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the normal distribution as an approximation to the binomial distribution, as described in Part 1 of this section.
Is Nessie Real? This question was posted on the America Online website: Do you believe the Loch Ness monster exists? Among 21,346 responses, 64% were 鈥測es.鈥 Use a 0.01 significance level to test the claim that most people believe that the Loch Ness monster exists. How is the conclusion affected by the fact that Internet users who saw the question could decide whether to respond?
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