A company wants to estimate the proportion of employees who have children of daycare age to within 5%, with 95% confidence. No estimate is available. How big a sample size is necessary? How big a sample size would be required if the confidence level increased to 98%?
Answer to relevant QuestionsA researcher wants to estimate the average grocery bill of households whose members shop at a particular supermarket to within $10, with 95% confidence. How big a sample size is necessary? A preliminary sample revealed a ...The manager of a college coffee shop believes that members of the college community spend an average of about $6 a week on morning coffees. You conduct a random sample of the college community, and find that the data on ...You want to know the average grade on a statistics test, but the teacher will not provide the information. You take a random sample of the marks of 20 students who wrote the test. The results are available in MyStatLab. ...A maker of toothpaste is doing quality control tests on the amount of toothpaste in the tubes. Thirty tubes of toothpaste are randomly selected, and the quantity of toothpaste in each tube is precisely measured, in ...Refer to the information in Exercise 3a above. a. How large a sample would be required to estimate the average number of web pages visited per month by Canadian Internet users to within 100 pages, with 95% confidence? b. How ...
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