The National Weather Service says that the mean daily high temperature for October in a large midwestern city is 59 °F. A local weather service suspects thatthis value is not accurate and wants to perform a hypothesis test to determine whether the mean is actually lower than 59 °F. A sample of mean daily hightemperatures for October over the past 39 years yields x =57 °F. Assume that the population standard deviation is 5.9 °F. Perform the hypothesis test at thea=0.05 significance level.H:p=59 °FH:p<59 °FTest statistic: z=-2.12Critical value : z=-1.64Reject H:u=59 °F there is sufficient evidence to support the claim that the mean is lessthan 59 °F.Ho:H= 59 °FH: p> 59 °FTest statistic:z=-2.12Critical value : z=-1.64Fail to reject H:p=59 °F there is not sufficient evidence to support the claim that themean is less than 59 °F.

Given : sample size, n = 39 sample mean, x̄ = 57.0 population standard…

Answered: The National Weather Service says that…

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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The mean age when smokers first start is 13 years old with a population standard deviation of 1.8 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS—electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 30 smokers found that their mean starting age was 12.2 years old. Do the data support the claim at the 10% significance level? What are the correct hypotheses? H0: yearsH1: years Based on the hypotheses, find the following: Test Statistic z = (Give answer to at least 4 decimal places)Critical Values =± (Give answer to at least 4 decimal places) Based on the above we choose to The correct summary would be: that the claim that the mean age smokers first start is different than 13.
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