Answer to Question #139995 in Statistics and Probability for Manqoba Gebashe

Question

Suppose that a market research rm is hired to estimate the percent of adults living in a large

city who have cell phones. 500 randomly selected adult residents in this city are surveyed to

determine whether they have cell phones. Of the 500 people surveyed, 421 responded yes – they own cell phones.

3.1) Using a 90% confidence level, compute a confidence interval estimate for the true

proportion of adults residents of this city who have cell phones.(6)

3.2) Using a 99% confidence level, compute a confidence interval estimate for the true

proportion of adults residents of this city who have cell phones. (4)

3.3) Comment on the findings between questions 3.1 & 3.2 (2)

Answer 1

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