How large a sample should be taken to estimate the percentage of Canadian Internet users who visit social networking sites, to within 4%, with 96% confidence?
Answer to relevant QuestionsReturn to the confidence interval you constructed for Develop Your Skills 8.2, Exercise 6. The owner of the supermarket claims that the average household grocery bill is $95. Does the sample evidence support the owner's ...You are trying to estimate the percentage of households who have high-speed Internet access in the east end of St. John's, Newfoundland. A random sample of 50 households reveals 37 with high-speed Internet access. Estimate ...In a survey, 43% of the 2,450 respondents said they had phoned in sick when they were not ill. Construct a 99% confidence interval estimate for the proportion of workers who phone in sick when they are not ill. Do you think ...How large a sample size should the manufacturer described in Exercise 18 take if it wants to estimate annual maintenance costs for this entry-level compact in the third year of its life to within $10, with 98% confidence? A survey of 30 employees living in a large metropolitan area yielded an average of 54.2 hours of work per week, with a standard deviation of 3.2 hours. Provide a 99% confidence interval for average hours of work per week for ...
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