Question

.26 With reference to Exercise 2.64, test that the mean variance in order to conduct a test of hypothe- charge of the electron is the same for both tubes. Use ses that is intended to show that there is a α 0.05 difference in means? Explain how you would 8.27 With reference to the previous exercise, find a 90% proceed. (b) Conduct the test for part (a) using α 0.05 (c) Describe how you would randomize the assign- confidence interval for the difference of the two means. 8.28 Two chemical additives for drying paint are to be com- ment of paints when conducting this experiment. mean copper content is the same for both heats. confidence interval for the difference of the two pared. Five spray cans are prepared using Additive A and six are prepared using Additive B. Then l1 differ-8.29 With reference to Example 2, Chapter 2, test that the ent boards are sprayed, one can per board. (a) The response is the time in minutes for the surface 8.30 With reference to the previous exercise, find a 90% to dry, and the summary statistics are Standard means Sample size Mean deviation 16.3 12.1 8.31 Random samples are taken from two normal popula tions with σ| 10.8 and σ2 14.4 to test the null hypothesis μ-μ2 53.2 against the alternative hy- pothesis -2 53.2 at the level of significance 2.7 Additive A Additive B

• Use the problem in 8.28 to construct a 90% confidence interval of the difference between means. (8 pts)

Answer 1

5t6-2 4-856 . t tabutatro ualus 1y.do- fodf -833 4.a ± 1。833 × 1.3345