7 10:35 PM Quiz: Chapter 7 Quiz Submit Quiz This Question: 1 pt This Quiz: 10 pt

Question

7 10:35 PM Quiz: Chapter 7 Quiz Submit Quiz This Question: 1 pt This Quiz: 10 pts possible 6 of 10 (5 complete) A used car dealer says that the mean price of a three-year-old sports utility vehicle is $22,000. You suspect this claim is incomect and find that a random sample of 22 similar vehicles has a mean price of S22,532 and a standard deviation of $197 s there enough evidence to reject the claim at a F 0.017 Complete parts (a) through (e) below. Assume the population is normally distributed. A. Ho: S22.000 TO B. Ho S22.000 TO C. Ho H 00 Hat S22.000 Ha: $22,000 Ha us S22.000 O D. Ho: u $22.000 O E. Ho: u S22.000 O Ho: S22.000 Ha: u> S22,000 Ha ut $22.000 Ha u $22,000 (b) Find the critical value(s) and identify the rejection region (s) What is are) the critical value(s) to? (Use a comma to separate answers as needed. Round to three decimal places as needed.) Determine the rejection region(s). Select the comect choice below and fill in the answer box(es) within your choice. (Round to three decimal places as needed.) O A. t t and t O C. OD (c) Find the standardized test statistic t. t Round to two decimal places as needed Click to select your answer(s). 9:35 PM O Type here to search 4/21/2017 R2

Explanation / Answer

option D is correct

b) critical value =-2.8314 ; 2.8314

option C t<-2.8314 and t>2.8314

c)std error =std deviation/(n)1/2 =420.2186

hence test stat z=(X-mean)/std error =(22532-22000)/420.2186 =1.266

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