How much fat do reduced fat cookies typically have? You take a random sample of 51 reduced-fat cookies and test them in a lab,finding a mean fat content of 3.2 grams and a standard deviation of 1.1 grams of fat.Create a 99% confidence interval for the mean grams of fat.

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The 99% confidence interval is calculated using the formula: mean ± (critical value * (standard deviation/sqrt(n))). For a 99% confidence level and n=51, the critical value (z-score) is approximately 2.576. Plugging in the values: 3.2 ± (2.576 * (1.1/sqrt(51))) gives the interval (2.79, 3.61).

How Much Fat Do Reduced Fat Cookies Typically Have? You