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1.13 1.55 1.43 0.92 1.25 1.36 1.32 0.85 1.07 1.48 1.20 1.33 1.18 1.22 1.29 (a) Construct a 99% confidence interval for the mean number of characters printed before the printhead fails. The store manager is interested in knowing if the number of characters printed before the printhead fails is one million or not. State the appropriate hypotheses. Using the above CI what do you conclude? Inference for difference between two population means (Chapter 19) The Chapin Social Insight Test is a psychological test designed to measure how accurately a person appraises other people. The possible scores on the test range from 0 to 41. During the development of the Chapin test, it was given to several different groups of people. Do these data support the contention that female and male students differ in average social insight at significance level = 0.1?

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