450 Chapter 8 Hypothesis Testing 14. Internet Visits A U.S. Web Usage Snapshot indicated a monthly average of 36 Internet visits a particular website per user from home. A random sample of 24 Internet users yielded a sample mean of 42.1 visits with a standard deviation of 5.3. At the 0.01 level of significance, can it be concluded that this differs from the national average? Source: New York Times Almanac.

age, a Bahand will last 6.3 days from the time it is purchased in the store to the time it is too rotten to eat. Is the mean time to spoil different if the banana is hung from the ceiling? The data show results of an experiment with 15 bananas that are hung from the ceiling. Assume that that distribution of the population is normal. 5.5, 3.9, 3.9, 5.7, 6.5, 5.9, 3.9, 7.4, 4.3, 5.9, 4.5, 4.2, 7, 5.1, 4 What can be concluded at the the a = 0.05 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ? Select an answer H₁: ? Select an answer c. The test statistic ? O (please show your answer to 3 decimal places.) (Please show your answer to 4 decimal places.) d. The p-value = e. The p-value is ? a f. Based on this, we should Select an answer the null hypothesis. g. Thus, the final conclusion is that ... The data suggest the populaton mean is significantly different from 6.3 at a = 0.05, so there is…

Use the given minimum and maximum data entries, and the number of classes, to find the class width, the lower class lirmits, and the upper class limits. minimum = 7, maximum = 93, 6 classes %3D The class width is. Choose the correct lower class limits below. O A. 7, 21, 37, 51, 66, 82 O B. 22, 36, 52, 67, 82, 96 O C. 7, 22, 37, 52, 67, 82 O D. 21, 36, 52, 66, 81, 96 Choose the correct upper class limits below. O A. 22, 37, 51, 66, 82, 96 O B. 21, 36, 52, 67, 81, 96 O C. 22, 37, 52, 67, 82, 96

DATAfile: Costco You may need to use the appropriate technology to answer this question. Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of ? = 13 is expected. In 2012, Costco, with its 432 warehouses in 40 states, was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores follows. 95 90 83 75 95 98 80 83 82 93 86 80 94 64 62 (a) What is the sample mean customer satisfaction score for Costco?   (b) What is the sample variance? (Round your answer to two decimal places.)   (c) What is the sample standard deviation? (Round your answer to two decimal places.)   (d) Construct a hypothesis test to determine whether the population standard deviation of ? = 13 should be rejected for Costco. With a 0.05 level of significance, what is your conclusion?…