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A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 5555 women over the age of 50 used the new cream for 6 months. Of those 5555 women, 4242 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 6060% of women over the age of 50? Test using ?=0.05α=0.05. (a) Test statistic: ?=z= (b) Critical Value: ?∗

A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 5555 women over the age of 50 used the new cream for 6 months. Of those 5555 women, 4242 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 6060% of women over the age of 50? Test using ?=0.05α=0.05. (a) Test statistic: ?=z= (b) Critical Value: ?∗

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 5555 women over the age of 50 used the new cream for 6 months. Of those 5555 women, 4242 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 6060% of women over the age of 50? Test using ?=0.05α=0.05.

(a) Test statistic: ?=z=

(b) Critical Value: ?∗

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