1.

Recall the method used to obtain a condence interval for the difference between two population means for matched samples. (a) The following data are from matched samples taken from two populations. Compute the difference value for each element. {Use Population 1 7 Population 2.) 1 11 8 2 7 8 3 9 6 4 12 7 5 13 10 6 15 15 I" 15 14 (b) Compute 3. |:| (c) Compute the standard deviation Sd' (Round your answer to two decimal places.) |:| (d) What is the point estimate of the difference between the two population means? (Use Population 1 Population 2.) |:| (e) Provide a 95% condence interval for the difference between the two population means. {Use Population 1 Population 2. Round your answers to two decimal places.) |:|t|:| A market research rm used a sample of individuals to rate the purchase potential Of a particular pmduct belure and after the Individuals saw a new teEevision commercial about the product. The purchase potential iatings were based on a 0 to 10 scale, With higher values indicating a higher purchase patential. The null hypothesis stated that the mean rating "afteH' would be less than or equal to the mean rating \"before." Rejection of this hypothesis would show that the commercial improved the mean purchase potential rating. Use a : 0.05 and the following data to test the hypothesis and oomn'iant on the value of the commercial. Pu'nchase Rating Individual Atta- We 1 6 5 2 6 4 3 7 8 4 4 3 5 3 5 6 9 8 7 7 5 8 6 6 A travel association reported the domestic airfare (in dollars) for business travel for the current year and the previous year. Below is a sample of 12 flights with their domestic airfares shown for both years. Current Previous Year Year 345 315 526 451 420 474 216 206 285 263 405 432 635 585 710 650 605 545 517 547 570 508 610 580A standardized exam consists of three parts: math, writing, and critical reading. Sample data showing the math and writing scores for a sample of 12 students who took the exam follow. Student Math Writing 1 540 474 2 432 380 3 528 463 4 574 612 5 448 420 6 502 526 7 480 430 8 499 459 9 610 615 10 572 541 11 390 335 12 593 613Consider the hypothesis test. Ho: P1 - P2 50 H, : P1 - P> >0 The following results are for independent samples taken from the two populations. Sample 1 Sample 2 n, = 200 n, = 300 P, = 0.22 P2 = 0.14