Question

In: Statistics and Probability

​Claim: The mean pulse rate​ (in beats per​ minute) of adult males is equal to 69...

​Claim: The mean pulse rate​ (in beats per​ minute) of adult males is equal to 69 bpm. For a random sample of 141 adult​ males, the mean pulse rate is 68.5 bpm and the standard deviation is 10.6 bpm. Find the value of the test statistic. ​

Claim: Fewer than 90​% of adults have a cell phone. In a reputable poll of 1190 ​adults, 81​% said that they have a cell phone. Find the value of the test statistic.

Solutions

Expert Solution

1) Ho : = 69 Vs H1 : 69

Test statistic t = (xbar - )/(s/√n)

t = (68.5 -69)/(10.6/√141)

t = -0.56

2) here p= 0.90 , n = 1190 , p^ = 0.81

Test statistic Z = (p^ - p)/sqrt[p*q/n]

Z = (0.81-0.90)/sqrt[0.90*0.10/1190]

Z = -10.35


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