STAT assignment

STAT 509 Assignment# 5 Name_______________________

Instructions:

1) Due Date

· May 11 @ 11:50pm

2) Assignment submission:

· When you submit an electronic file (assignment) you must use the following format: This is for: LAST NAME (in upper case), your first name, the course code, activity/assignment number and file format

· For example: SMITHJohn-STAT509-A1.doc

Assignment: (show your work)

1. Use table 1 to answer the following question:

· Is there a significant difference in birth weight (g) between manual and spontaneous removal of the placenta? Use the confidence interval method at an alpha of 0.05.

2. Test if the average weight for children is 40 lbs. Use the confidence interval method at an alpha of 0.05. Note that the mean and standard deviation for the 168 subject is 35.6±8.59.

3. The following data are the systolic blood pressures when standing and when horizontal of 12 healthy adults. Construct a 90% confidence interval for the population mean difference between the standing systolic blood pressure and the supine systolic blood pressure. Assume that the population of differences is normally distributed.

Subject	Standing	Supine
1	142	146
2	143	137
3	132	141
4	160	157
5	127	134
6	145	149
7	135	133
8	146	151
9	135	139
10	156	163
11	131	120
12	144	152

Source: Morales M, Ceysens G, Jastrow N, Viardot C, Faron G, Vial Y, et al. Spontaneous delivery or manual removal of the placenta during caesarean section: a randomised controlled trial. BJOG. 2004;111(9):908-12.