2010-08-15_201303_Answer_for_week6lab

2010-08-15_201303_Answer_for_week6lab - Math 221 ****...

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Unformatted text preview: Math 221 **** Example Format **** Week 6 Lab Submitted by: (Insert Name Here **REMOVE THIS NOTE PRIOR TO SUBMITTING**) (Note: Your labs should be well organized, with results clearly identified and in the proper order. When answering questions, be sure to use complete sentences and proper grammar. It is also important for you to fully explain your answers! Please do not answer “yes” (or “no”); you should explain why the answer is “yes”. **REMOVE THIS NOTE PRIOR TO SUBMITTING**) Part 1. Normal Distributions and Birth Weights in America (Insert your answers to the 5 questions on Birth Weights here. Be sure to carefully follow the examples worked in the Normal Ex worksheet from the Week6Lab.xls file. Copy-and-paste the Excel commands and/or Normal Probability Distributions you use to answer Questions 2a, 3a and 4a. You do not need to copy-and-paste anything for the other questions; you must provide your answers, however. **REMOVE THIS NOTE PRIOR TO SUBMITTING**) a) We see from the graph that μ is between 7 and 7.5 , the only period of gestation having a mean between 7 and 7.5 is: 37 to 39 weeks ( μ is 7.33) Answer: 37 to 39 weeks b) We see from the graph that μ is between 7.5 and 8 , and the distance between μ and 7 seems to be 2 times the distance between μ and 8 so μ is approx 7 2/3= 7.667 so we select the gestation period: 42 weeks and over (having a mean of 7.65) Answer: 42 weeks and over c) We see from the graph that μ is a little greater than 4 , the only period gestation having that mean is 28 to 31 weeks (it has a mean of 4.07) Answer: 28 to 31 weeks 2) a) X= weight of birth (period: 28 weeks), μ =1.88 σ =1.19 P(X<5.5) = NORMDIST(5.5,1.88,1.19,TRUE)= 0.9988 Answer: 99.88 % b) X= weight of birth (period 32 to 35 weeks), μ =5.73 σ =1.48 P(X<5.5) =0.4383 Answer: 43.83 % c) X= weight of birth (period 37 to 39 weeks),...
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This note was uploaded on 02/08/2011 for the course MATH Statistics taught by Professor Yusef during the Spring '10 term at DeVry Chicago O'Hare.

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2010-08-15_201303_Answer_for_week6lab - Math 221 ****...

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