the nte na Reva nue ServicR RS) pro n es a tc help lina ror taxpayes to call in

Question

the nte na Reva nue ServicR RS) pro n es a tc help lina ror taxpayes to call in an get answers to questions as theyrepar the r a r turns n recent yea s the R has been inundated with taxpayer calls and has red signed its phone serv ca as well as pasting answers to frequently asked questions on its website (The Cincinmati Enquirer, January 7, 2010). According to a report by a taxpayer advacate,callers using the new system can expect to wait on hold for an unreasonably lang time of 13 minutes before being able to talk to an RS emplu ee Suppose you select sample u 50 ca lers a er he neKV phone service has been implemented; he sam e results shon mean wa ng me o 1 manutes before an employee cu nes on line. Based upon da a rom past years, you dec de l is reasonable to assume that the standard deviation of waiting times is 9 minutes. Use -0.05. a. State the hypotheses Ha: | less than 13 b. What is the p-value (tu 4 detimals)?

Explanation / Answer

here std error of mean =std deviation/(n)1/2 =9/(50)1/2 =1.2728

hence test stat z =(x-mean)/std error =(11-13)/1.2728=-1.5713

for above one tailed test and test stat ; p value =0.0581

please revert for any clarificaiton required.

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