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Coastal Star Sales Corporation Is A-Level Coursework

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Calculate a confidence interval at 95% to get an interval estimate for a proposition. 4.29 5-in a nationwide survey, a researcher expects that 30% of the population will agree with an attitude statement. She wishes to have less than 2% error and to be 95% confident. What sample size is needed? 30

6- City Opera, a local opera company wishes to take a sample of its subscribers to learn the average number of years people have been subscribing. The director of research expects the average to be 12 years and believes the standard deviation will be about 2 years...

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She wishes to be 95% confident of her estimate. What is the appropriate sample size? 12
7- a researcher expects the population proportion of Cubs fans in Chicago to be 80%. The researcher wishes to have an error less than 5% and to be 95% confident of an estimate to be made of a mail survey. What sample size is required? 66

8-an automobile dealership plans to conduct a survey to determine what proportion of a new-car buyers continue to have their cars service at the dealership after the warranty period…

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8-an automobile dealership plans to conduct a survey to determine what proportion of a new-car buyers continue to have their cars service at the dealership after the warranty period ends. It estimates that 30% of customers do so. It wants the result of its survey to be accurate within 5% and it wants to be 95% confident of the results. What sample size is necessary? 28

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Creative Research Systems. Sample Size Calculator. Retrieved on January 24, 2011 from: http://www.surveysystem.com/sscalc.htm
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