2. Suppose you are studying the life history of grizzly bears (Ursus arctos). You collect a sample of 30 bears and you find that the average age (y) for the adult bears is 25 years with a standard deviation (s) of 4 years. a. Construct a 95% confidence interval for μ. b. Would a 90% confidence interval be larger or smaller than the 95% CI you constructed? 3. Now you want to test the null hypothesis that the population mean life span for grizzly bears is 28 years. Use the data in #2 to test this null hypothesis by performing a complete one-sample t-test. Use a = .01. Make sure to write out your conclusion (about age in bears).

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