week_6_lab

# week_6_lab - Math 221 Week 6 Lab Submitted by James Rigney...

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Math 221 Week 6 Lab Submitted by: James Rigney Part 1. Normal Distributions and Birth Weights in America Gestation Period Mean Birth Weight Standard Deviatio n Under 28 Weeks 1.88 1.19 Answer 28 to 31 Weeks 4.07 1.87 Question 2 a 0.9988 (=NORMDIST(5.5,H3,I3,TRU E) 32 to 35 Weeks 5.73 1.48 36 Weeks 6.46 1.2 Question 3 a 8.7269 (=NORMINV(0.9,H7,I7)) 37 to 39 Weeks 7.33 1.09 40 Weeks 7.72 1.05 Question 4 a 0.4141 (=NORMDIST(9,5.73,1.48,TR UE)- NORMDIST(6,5.73,1.48,TRU E)) 41 Weeks 7.83 1.08 42 Weeks and over 7.65 1.12 Part 2. Age Distribution in the United States Answer Question 1 49.5 Question 2 1.824 Question 3 No.  Ages of people decrease as the ages increase -  not just in the US but in all countries. Question 4 Question 5 30 Question 6

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Part 3. Finding z- and t-scores for Confidence Intervals 1. Using Excel, find the z-score that corresponds to the following Confidence Levels: a. 80% = 1.28155 b. 85% = 1.43953 c. 92% = 1.75069 d. 97% = 2.17009 2. Using Excel, find the t-score that corresponds to the following Confidence Levels and
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week_6_lab - Math 221 Week 6 Lab Submitted by James Rigney...

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