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Unformatted text preview: 1 These questions are actual exam questions used at one time during the teaching of this class. These questions will not be used again. They are a study guide only. These questions MAY NOT be used during any WCOB 1033 Exams ________________________________________________________________ Chapters 9, 10 ,11, 12 and 13 Use the following information for questions 1-3. A manager of a recording company wants to know if U of A students are different from other college students in terms of whether they will buy the latest Radiohead CD at $17.99. Nationally, he knows that 12% will do so. He randomly samples 400 U of A students and asks them if they would buy the latest Radiohead CD for $17.99. He records their responses (1=yes, 2=no) in an Excel spreadsheet. 1. Which of the following is the proper set of hypotheses? a. H o : p=12 H 1 : p<12 b. H o : p 12 H 1 : p=12 c. H o : =12 H 1 : 12 d. H o : =12 H 1 : >12 e. H o : p=12 H 1 : p 12 He ran a statistical analysis and the results are displayed below. z est: Proportion-T Would Buy Sa o mple Observ Hypoth z Stat P(Z<=z) on 0.0453 z Critic .6449 P(Z<=z 0.0906 Critical two-tail 1.96 2. o at the .05 significance level o at the .10 significance level e with 95% confidence that U of A students differ from the national Pr portion 0.1475 ations 400 esized Proportion 0.12 1.6925 e-tail al one-tail 1 ) two-tail z What is the correct decision based on this output? a. Reject H b. Reject H c. Conclud average d. Both a and c are correct ack of sleep costs companies about $18 billion a year in lost productivity, according to p to the problem, however. ome e for study or sleep. Power naps are in vogue Athens 0). A major airline recently began encouraging n Excel file gives the number of ompla h of a sample of 10 reservation agents during the six onths uraged and during the six months after the policy change. o the data present sufficient evidence to conclude that the new napping policy reduced s .05. 4 lysis for his problem? a. Independent samples t test b. Matched-pai One sample t st of variance Below is the output of statistical tests on ay be correct. mple for Variances 1999 No. of complaints 2000 No. of complaints e. None of the above 3. If you conducted a two-tailed test of a population proportion and you obtained the test statistic of z=1.77, what would be its p-value? a. .0384 b. .4616 c. .9232 d. .0768 Use the following information for questions 4-8. L the National Sleep Foundation. Companies are waking u S ven have quiet rooms available ( Daily News , Jan. 9, 200 reservation agents to nap during their breaks. A c ints received about eac m before naps were enco D the mean number of customer complaints about reservation agents? Assume alpha i . What is the best statistical ana t rs t-test -test c....
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This note was uploaded on 03/15/2011 for the course WCOB 1033 taught by Professor Jensen during the Spring '05 term at Arkansas.
- Spring '05
- The Lottery