Ten years ago, the average amount of time a family spent eating supper together was 27.8 minutes. A sociologist believes this average has decreased. She randomly selects a sample of 12 families and finds the sample average to be 24.307 minutes. She calculated a test statistic of t = -1.661. (a) What is the p-value ? [10/29/12 8:27:18 AM] angiebaby: Suppose we test Ho: ? = 0 versus Ha: ? > 0, and get a P-value of 0.02. (a) What would the decision be for a significance level of 0.05? Interpret in context. 1. Reject the null hypothesis. There is sufficient evidence that the mean is greater than 0.. 2. Reject the null hypothesis. There is insufficient evidence that the mean is greater than 0. 3. Fail to reject the null hypothesis. There is sufficient evidence that the mean is greater than 0. 4. Fail to reject the null hypothesis. There is insufficient evidence that the mean is greater than 0..
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