stat217 WEBWORK Ex x C O https://drive google.com/drive/folders/0BweGY6ZIvq3EOTA
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stat217 WEBWORK Ex x C O https://drive google.com/drive/folders/0BweGY6ZIvq3EOTAyuxdnzzzzcHM ANSWERS ONLY CHECKED ANSWERS NOT (9 points) Do you believe that the average age of first time parents are getting to be exceedingly old? One study suggests the average age of first time mother's maybe as old as 30.Itis believed the proportion of first time mothers who are over the age of 30 is 33.3%, of 371 first time parents finds that the sample proportion of mothers over found to less a survey change in the age of first 30 is be than 0.296 or more than o.37, a cultural time mothers will be suspected. What is the minimum number out of this 371 that would you question that the proportion, of first time mothers who are over the age of make 30, is too high? Answer 137 (integer) What is the maximum number out of this 371 that would make you question that the proportion, offirst time mothers who are over the age of 30, is too low? Answer 110 (integer) Find the absolute value of the critical values in terms of the standard normal scale, Z. Enter your answer to at least three decimal places. 1.5157 What level of a was used here? Enter your answer to at least three decimal places. a 0.1295 f the actual proportion, of first time mothers who are over the age of 30, is 0.3576, then what is the probability that our sample our beliefs, would have lead us to believe that the proportion, of first time mothers who are over the age of 30, was too high? Use at least three digits. 10 Ji Answer 0.2295Explanation / Answer
a)here minimum number of first mother that is considered to be too high <np=371*0.296=109.816
as it should be less then 109.816; hence correct answer is 109
b)maximum mumber of first mother that is considered to be too high>np =371*0.37=137.27
as it should be greater then 137.27 hence 138
c)our derived proportion p=0.333
hence std error =(p(1-p)/n)1/2=0.0244
hence critiical value =(phat-p)/std error =(0.37-0.333)/0.0244=1.51218
d)as out confidence level falls outside the critical value 0.37, we reject the null hypothesis
option B
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