Problem 6 a random sample of 1562 undergraduates enrolled in a marketing course was asked to respond on a scale from one (strongly disagree) to seven (strongly agree) with the proposition: "advertising raise our standard of living." the sample mean response was 4.27, and the sample standard deviation was 1.32. test the null hypothesis that the population mean is 4, against the alternative hypothesis that it is not 4. use a 1% level of significance. multiple choice #22 the test statistic and its sampling distribution are a.   x ~ n 0,1 s n   by the central limit theorem since n = 1562 is large and σ is unknown b.   x ~ n 0,1 n    by the clt since n = 1562 is large c. n 1 x ~ t s n    by the clt since n = 1562 is large and σ is unknown d. n 1 x ~ t s n    because the population is normal and σ is unknown 14 multiple choice #23 the 99% ci interval for  is c 4.18 4.36 0.99      . therefore a. accept h0 b. reject h0 in favor of ha multiple choice #24 what is the shape of the rejection probability curve? a. b. c. μ p(h0 is rejected | μ) μ