Use the data in the table to answer the following questions by using MINITAB.

Current ratios for GM and Ford

(a) Test whether the current ratio is equal to 1 for both GM and Ford, respectively, at α = .05.

(b) Construct a 95%confidence interval of current ratio for both GM and Ford.

(c) Test whether there is a difference between current ratios of Ford and GM at α = .05. (Assume that their variances are different.)

(d) Test whether there is a difference between current ratios of Ford and GM at α = .05. (Assume that their variances are equal.)

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Year 81 82 83 84 85 86 87 88 89 90 Ford 1.02 .84 1.05 1.11 1.10 1.18 1.24 1.00 .97 .93 GM 1.09 1.13 1.40 1.36 1.09 1.17 1.56 1.00 1.72 1.37