1 Determine Whether The Samples Are Independent Or Are Matched Pairs Detroit Technical College Wants To Ascertain Whet 1 (50.72 KiB) Viewed 32 times
1 Determine Whether The Samples Are Independent Or Are Matched Pairs Detroit Technical College Wants To Ascertain Whet 2 (47.31 KiB) Viewed 32 times
1) Determine whether the samples are independent or are matched pairs: Detroit Technical College wants to ascertain whether their students are learning what they need to learn, and give a test to 25 randomly selected students in the "electrical department" the first day of classes, and then give the same 25 students the same test on the last day of classes. a) Matched Pairs b) Both c) Neither d) Independent Samples 2) Determine whether the samples are independent or are matched pairs: Detroit Technical College wants to ascertain whether their students are learning what they need to learn and give a test to 20 randomly selected students in the "Beginning Automotive" course, and the same test to 20 randomly selected students in the "Beginning Electricity" course. a) Matched Pairs b) Neither c) Both d) Independent Samples 3) In crash tests at 5mph, the mean bumper repair cost for 14 randomly selected small cars (group 1 ) was $473, with standard deviation $190. In similar tests of 22 midsize cars (group 2 ), the mean bumper
repair cost is $741, with standard deviation $205. Use a 0.05 significance level to test the claim that the mean bumper repair cost for small cars is less than for midsize cars. State the null and alternative hypotheses. a) H:μ1>μ2 b) H o: μ1≤μ2 c) H o μ1=μ2 Ho: μ1≥μ2 a) Ha:μ1≤μ2 b) Ha:μ1>μ2 c) Ha:μ1=μ2 d) Ha:μ1<μ2 4) See problem 3. State the critical value. Hint: use the df your calculator provides (and Table A-3), so maybe you should do the next two problems and then come back to this one. a) 1.691 b) 1.688 c) −1.691 d) −3.962 5) See problem 3. Perform STAT>TESTS >2-SAMPTTest, and then report your test statistic. Hint: pooled should be YES. a) 3.931 b) 1.19705 c) 2.973 d) −3.931 6) See problem 3. Calculate the pvalue. a) 0.0039 b) 1.9705 c) 1.9705×10−4 d) 0.0025 7) See problem 3. Calculate the appropriate confidence interval. a) (−407,−130) b) (−406.5,−129.5) c) (−383,−153) d) (−454,−82) 8) See problem 3. State the technical conclusion based on the traditional method. a) The test statistic is closer to zero than is the critical value; Reject Ho. b) The test statistic is closer to zero than is the critical value; FTR Ho. c) The test statistic is further from zero than is the critical value; Reject Ho. d) The test statistic is further from zero than is the critical value; FTR Ho.
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