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T Values, Market Performances, and Descriptive Statistics

1. The table t value associated with 21 degrees of freedom and used to compute a 90% confidence interval is _______.

2. Circuit boards for wireless telephones are etched, in an acid bath, in batches of 100 boards. A sample of seven boards is randomly selected from each lot for inspection. A particular batch contains two defective boards; and x is the number of defective boards in the sample. P(x=0) is _______.

Describe what these descriptive statistics reveal about the market performance of these two stocks.

3. Annualized rates of return were calculated from closing prices of Caterpillar (CAT) and General Mills (GIS) common stock. Descriptive statistics of these rates of return presented in the following table.

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This solution provides equations and solutions for t-values, market performances, and descriptive statistics.

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