Question: The average number of weeks that banner ads run at
The average number of weeks that banner ads run at a Web site is estimated to be 5.5. You want to check the accuracy of this estimate. A sample of 50 ads reveals a sample average of 5.1 weeks with a sample standard deviation of 2.3 weeks. State the null and alternative hypotheses and carry out the test at the 5% level of significance.
Answer to relevant QuestionsAccording to The New York Times, 3-D printers are now becoming a reality. If a manufacturer of the new high-tech printers claims that the new device can print a page in 3 seconds on average, and a random sample of 20 pages ...The best places in the United States to be a job seeker are state capitals and university towns, which are claimed to have jobless rates below the national average of 4.2%. A sample of 50 towns and state capitals showed ...The photography department of a fashion magazine needs to choose a camera. Of the two models the department is considering, one is made by Nikon and one by Minolta. The department contracts with an agency to determine if one ...The recent boom in sales of travel books has led to the marketing of other travel-related guides, such as video travel guides and audio walking-tour tapes. Waldenbooks has been studying the market for these travel guides. In ...An article reports the results of an analysis of stock market returns before and after antitrust trials that resulted in the breakup of AT&T. The study concentrated on two periods: the pre-antitrust period of 1966 to 1973, ...
Post your question