Statistics (High School) quiz

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Sample questions

• Two possible wordings for a questionnaire on a proposed school budget increase are as follows:
• Which of the following statements is (are) true? I. In order to use a χ2 procedure, the expected value for each cell of a one- or two-way table must be at least 5. II. In order to use χ2 procedures, you must have at least 2 degrees of freedom. III. In a 4 × 2 two-way table, the number of degrees of freedom is 3.
• In comparing the life expectancies of two models of refrigerators, the average years before complete breakdown of 10 model A refrigerators is compared with that of 15 model B refrigerators. The 90% confidence interval estimate of the difference is (6, 12). Which of the following is the most reasonable conclusion?

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