10.61 The following data (stored in the file ) represent the nationwide highest yield of different types of accounts (extracted from Bankrate.com, March 31, 2008): Money Market Six Month CD 4 3.85 3.82 3.6 3.8 3.6 3.75 3.45 3.75 3.43 a. At the 0.05 level of significance, is there evidence of a difference in the mean yields of the different accounts? b. If appropriate, determine which accounts differ in mean yields c. At the 0.05 level of significance, is there evidence of a difference in the variation in yields among the different accounts? d. What effect does your result in (c) have on the validity of the results in (a) and (b)?
11-25 Where people turn to for news is different for various age groups. A study indicated where different age groups primarily get their news: MEDIA Under 36 36-50 50+ Local TV 107 119 133 National TV 73 102 127 Radio 75 97 109 Local Newspaper 52 79 107 Internet 95 83 76 At the 0.05 level of significance, is there evidence of a significant relationship between the age group and where people primarily get their news? If so, explain the relationship.
12.1 Fitting a straight line to a set of data yields the following prediction line: Yi = 2 + 5Xi a. Interpret the meaning of the Y intercept, b0. b. Interpret the meaning of the slope, b1. c. Predict the value of Y for X = 3.
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