A researcher wishes to determine how much money per week is spent ongroceries in a small Western city. He wants to be 98% confident that he is within $3 of thetrue mean. Assume the standard deviation is $18. How large a sample is necessary'?

Given : ME< 3.0 σ= 18.0 At 98.0 % confidence level , z score= 2.326 Need to find the minimum…

Answered: A researcher wishes to determine how…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A marketing specialist wants to estimate the average amount spent by visitors to an online retailer's newly-designed website. From the data in a preliminary study she guesses that the standard deviation of the amount spent is about 14 dollars. Question 1. How large a sample should she take to estimate the mean amount spent to within 5 dollars with 95% confidence? (Round your answer up to the next largest integer).
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A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data set, his height converts to the z score of 5.17. How many standard deviations is his height above the mean?
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A researcher wishes to determine how much money per week is spent on groceries in a small Western city. He wants to be 98% confident that he is within $3 of the true mean. Assume the standard deviation is $18. How large a sample is necessary'?