According to the Centers for Disease Control and Prevention, average life expectancy in the United States has risen to 77.6 years (source: cnn.com). It has been suggested that residents in rural areas of the Southwest have a shorter life span than the general population. In a random sample of 250 recently deceased residents of the rural Southwest, the average life span was 75.9 years with a sample standard deviation of 9.8 years. Is the sample evidence sufficient to reject the null hypothesis shown below? Use a significance level of .05. H0: μ > 77.6 (The average life expectancy for residents of the rural Southwest is at least as long as the national average.) Ha: μ < 77.6 (The average life expectancy for residents of the rural Southwest is shorter than the national average.)
Answer to relevant QuestionsRefer to Exercise 48. Suppose the sample size was 25 rather than 250. Assume the population distribution is approximately normal. Revise the test you set up and report your decision. Refer to Exercise 52. Suppose the sample size was 12 rather than 200. Revise the test you set up and report your decision. Assume the population distribution is approximately normal. In exercise A study in the Annals of ...The competing hypotheses for a particular hypothesis test are as follows: H0: μ > 2000 Ha: μ < 2000 A random sample of size 100 is taken from the target population. The sample mean is 1955. Assume the population standard ...If production workers are performing their jobs properly, boxes of powdered detergent produced by your company should contain, on average, 30 ounces of powder, no more and no less. You will periodically select a sample of 36 ...Jill Kindler, your top salesperson, claims that she averages more than 25 sales calls per day. From her daily log you randomly select a sample of five days with the following results: Use this data to test a skeptical null ...
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