Question

(5 points) Weight gain during pregnancy. In 2004, the state of North Carolina released to the public a large data set containing information on births recorded in this state. This data set has been of interest to medical researchers who are studying the relationship between habits and practices of expectant mothers and the birth of their children. The following histograms show the distributions of weight gain during pregnancy by 869 younger moms (less than 35 years old) and 134 mature moms (35 years old and over) who have been randomly sampled from this large data set. The average weight gain of younger moms is 30.32 pounds, with a standard deviation of 14.47 pounds, and the average weight gain of mature moms is 28.83 pounds, with a standard deviation of 13.64 pounds. Do these data provide strong evidence that there is a significant difference between the two population means? Conduct a hypothesis test. Round all numeric answers to 4 decimal places. 250- Younger mom 125 0 0 40 60 80 40- Mature mom 20- 0 80 60 0 40 Weight gain (in pounds) 1. Which set of hypotheses should the researcher use? А. Но: Рi — Р2 %3 0, НA: Pі — Р2 <0 ов. Но: и — из%3D 0, НА: иј — и2 #0 С. Но: и — н2 %3D 0, На: и — н2 >0 D. Ho: Pi — P2 %3D 0, На: Рі — Р2 #0 2. Calculate the test statistic. t 3. Calculate the p-value for this hypothesis test p value

Answer 1

solution Heru Prom the givem data 30-32 1869 1IU7 2134 228.83, 213.64 2 S.EE + 1.2765 13 M lu 698 30.32-28 831.1673 Test Maiuitic Z 1276S S-E - P(21673) x2 = 61215)x2 = 0-243 P- Value here Ihe sarmple za are Jange 2-tables So, uoe Lam use