A question that obstetrician often wonder is whether the weight of a baby twin h
ID: 3311543 • Letter: A
Question
A question that obstetrician often wonder is whether the weight of a baby twin has an influence on the order of birth. le Do heavier twins have a tendency of popping out first or possibly lighter twins tend pop out first? Let denote the mean weight of first twin to be born and denote the mean weight of the second twin to be born. Given that we don't have any preconceived idea of which should come out first what is the hypothesis of interest? d 86% 2:43 PM HpWF-us * 0 against Haas-us:0 HoF s 0 against HAF 0 Question Details My Notes Ask Your To test the twin weight hypothesis discussed in Question 1, the weights of 19 twins were collected and the ordering in birth. A snap shot of the data and the scatterplot of weight of the first born against the second born is given below FirstBorn .93755.562S 5.6875 6.43755.8125 6.43757.5625 S.S 75 5.8125 .375 7.562S S.1875 4.3125 5.5625 5.875 4.875 4.68754.6875 6.125 7,5625 5.6875 5.43755 4.3754.9375 5.25 5.1875 3.5 3.9375 5.125 5.625 5.125 4.5 5.3125 4.8125 6.125 6.375 FirstBorn Based on how the data was collected and the plots what test should be done? B An independent sample 1-test needs to done because there is no matching between the two data sets (C)Anone-sample test on the differences in weights of the twins needs to be done (A) and (C) since they are exactly the same (AJA matched ttest needs to be used because there is a clear matching in the between the twins. Furthermore, the scatterplot shows a clear dependence between the weights of twins. Thus backing the need to do a matched t-test Submit AnswerExplanation / Answer
Q1.
Since we have no pre conceived information, the correct answer for the hypothesis is - C
Q2.
A matched samples t test is to be done which is also backed by the scatterplo given.
This is same as one sample test on differences in mean
Hence, the correct answer is (A) and (C) since they are same.
Note: Solving 2 questions.