s spend in the stores during shopping trips. TI consultant and ask her to determine the mea ers at the supermarkets. The consultant will c shopping times at the supermarkets and use times to estimate u. Assuming that the standa n of shopping times at the supermarkets is 29 urt sample size she must collect in order for her

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Executives of a supermarket chain are interested in the amount of time that
customers spend in the stores during shopping trips. The executives hire a
statistical consultant and ask her to determine the mean shopping time, µ,
of customers at the supermarkets. The consultant will collect a random
sample of shopping times at the supermarkets and use the mean of these
shopping times to estimate u. Assuming that the standard deviation of the M
population of shopping times at the supermarkets is 29 minutes, what is the
minimum sample size she must collect in order for her to be 90% confident
that her estimate is within s minutes of µ?
Carry your intermediate computations to at least three decimal places.
Write your answer as a whole number (and make sure that it is the
minimum whole number that satisfies the requirements).
(If necessary, consult a list of formulas.)
?
Transcribed Image Text:Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The executives hire a statistical consultant and ask her to determine the mean shopping time, µ, of customers at the supermarkets. The consultant will collect a random sample of shopping times at the supermarkets and use the mean of these shopping times to estimate u. Assuming that the standard deviation of the M population of shopping times at the supermarkets is 29 minutes, what is the minimum sample size she must collect in order for her to be 90% confident that her estimate is within s minutes of µ? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.) ?
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