Two different analytical tests can be used to determine the impurity level in steel alloys. Eight specimens are tested using both procedures, and the results are shown in the following tabulation. Specimen 1 2 23 3 Test 1 1.2 1.3 1.5 1.3 2.0 2.1 1.7 1.3 1.6 (a) Is a paired t-test appropriate for testing whether the means from the two tests are the same? Explain. (b) Is there sufficient evidence to conclude that tests differ in the mean impurity level, using a = 0.05? (c) Is there evidence to support the claim that test 1 generates a mean difference of 0.1 units lower than test 2? Use a = 0.01. 4 5 6 7 8 1.5 1.4 Test 2 1.4 1.7 1.7 1.8 1.4

The average worker at a local brake manufacturer produces 10 brakes per day (other statistical information was not known).  An industrial psychologist was hired to increase worker productivity and a new assembly method was designed and tested in a sample of workers. Identify the appropriate test.   Select one: a. independent samples t test b. z test c. single sample t test d. paired samples t test

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Have you ever been frustrated because you could not get a container of some sort to release the last bit of its contents? An article reported on an investigation of this issue for various consumer products. Suppose five 6.0 oz tubes of toothpaste of a particular brand are randomly selected and squeezed until no more toothpaste will come out. Then each tube is cut open and the amount remaining is weighed, resulting in the following data: 0.51, 0.63, 0.42, 0.5, 0.35. Does it appear that the true average amount left is less than 10% of the advertised net contents? USE SALT (a) Check the validity of any assumptions necessary for testing the appropriate hypotheses. O The sample was randomly selected and the normal probability plot is not acceptably nonlinear. The sample was selected to represent a range of results and the normal probability plot is not acceptably nonlinear. The sample was selected to represent a range of results and the normal probability plot is not acceptably linear. O…

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