Answer Happy

1. The mean birth weight in the United States is 3315 grams. A sample of 74 births to mothers who smoked during pregnancy had a sample mean birth weight of 2773 grams, with a sample standard deviation of 660 grams. Suppose that you wish to use these results to address the following statistical question: Do the data present sufficient evidence to indicate that mean birth weight for all smoking mothers is less than the national average of 3315 grams? Use a 0.05. (A - 6 pts.) State the null hypothesis and the alternative hypothesis for this statistical question, using appropriate notation. Clearly identify what each symbol represents. (B-10 pts.) Compute the value of the test statistic for conducting Student's T-test. Show the formula and all computations. Report two digits past the decimal. (C-6 pts.) Identify the rejection region or report the p-value. You may use a diagram or picture if you want. Be sure to explain how you obtain any numbers that you use. (D-6 pts.) Draw a conclusion about weights of newborns born to smoking mothers, and express it meaningfully in words. Fully justify this conclusion