The TIV Telephone Company provides long-distance telephone service in an area. According to the companyâ€™s records,...

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The TIV Telephone Company provides long-distance telephoneservice in an area. According to the companyâ€™s records, the averagelength of all long-distance phone calls placed through this companyin 2015 was 12.44 minutes. The companyâ€™s management wants to checkif the mean length of the current long- distance calls is differentfrom 12.44 minutes. A sample of 150 such calls placed through thecompany produced a mean length of 13.71 minutes. The standarddeviation of all such calls is 2.65 minutes. Using a 2% level ofsignificance, can you conclude that the mean length of all currentlong-distance calls is different from 12.44 minutes? Hypothesis tobe tested (in words): Hypothesis to be tested (using symbols): H0 :H1 : Is this problem a (circle one): left-tailed test, right tailedtest, or a two-tailed test? a= ,x= ,sors= ,n= .
Test statistic =
The p-value =
Reject or fail to reject H0 (circle one) Rejection region(picture): Conclusion (in words):

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H0 The mean length is 1244 minutesH1 The mean length is not equal to 1244 minutesAs we are interested only in finding whether the mean isdifferent from 1244 it is two tailed test The mean could besmaller or See Answer

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