Key Concept. 155S6.3_3 Applications of Normal Distributions. October 04, Chapter 6 Normal Probability Distributions

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1 MAT 155 Statistical Analysis Dr. Claude Moore Cape Fear Community College Chapter 6 Normal Probability Distributions 6 1 Review and Preview 6 2 The Standard Normal Distribution 6 3 Applications of Normal Distributions 6 4 Sampling Distributions and Estimators 6 5 The Central Limit Theorem 6 6 Normal as Approximation to Binomial 6 7 Assessing Normality Technology for this chapter in order of priority (easy of use) are 1. Excel programs (created by Dr. Moore) 2. TI calculator 3. Statdisk (CD in textbook or download through CourseCompass See TI tutorials of normcdf and invnorm under the TI Calculator on the Important Links webpage. See Excel programs of Normal Distribution (xls) under the Technology on the Important Links webpage. Use Statdisk that came with your textbook or download Statdisk from CourseCompass. Key Concept This section presents methods for working with normal distributions that are not standard. That is, the mean is not 0 or the standard deviation is not 1, or both. The key concept is that we can use a simple conversion that allows us to standardize any normal distribution so that the same methods of the previous section can be used. Statdisk is very similar to Table A 2 in terms of what is need in order to use it. 1

2 Conversion Formula Converting to a Standard Normal Distribution Round z scores to 2 decimal places Example Weights of Water Taxi Passengers Example cont In the Chapter Problem, we noted that the safe load for a water taxi was found to be 3500 pounds. We also noted that the mean weight of a passenger was assumed to be 140 pounds. Assume the worst case that all passengers are men. Assume also that the weights of the men are normally distributed with a mean of 172 pounds and standard deviation of 29 pounds. If one man is randomly selected, what is the probability he weighs less than 174 pounds? 2

3 Example cont P ( x < 174 lb.) = P(z < 0.07) = Helpful Hints 1. Don t confuse z scores and areas. z scores are distances along the horizontal scale, but areas are regions under the normal curve. Table A 2 lists z scores in the left column and across the top row, but areas are found in the body of the table. 2. Choose the correct (right/left) side of the graph. 3. A z score must be negative whenever it is located in the left half of the normal distribution. 4. Areas (or probabilities) are positive or zero values, but they are never negative. Procedure for Finding Values Using Table A 2 and Formula Sketch a normal distribution curve, enter the given probability or percentage in the appropriate region of the graph, and identify the x value (s) being sought. Example Lightest and Heaviest Use the data from the previous example to determine what weight separates the lightest 99.5% from the heaviest 0.5%? 2. Use Table A 2 to find the z score corresponding to the cumulative left area bounded by x. Refer to the body of Table A 2 to find the closest area, then identify the corresponding z score. 3. Using Formula 6 2, enter the values for µ, s, and the z score found in Step 2, then solve for x. x = µ + (z s) (Another form of Formula 6 2) (If z is located to the left of the mean, be sure that it is a negative number.) 4. Refer to the sketch of the curve to verify that the solution makes sense in the context of the graph and the context of the problem. 3

4 Example Lightest and Heaviest cont x = µ + (z σ) x = ( ) x = (247 rounded) Example Lightest and Heaviest cont The weight of 247 pounds separates the lightest 99.5% from the heaviest 0.5% 4

5 Recap In this section we have discussed: Non standard normal distribution. Converting to a standard normal distribution. Procedures for finding values using Table A 2 and Formula /6. IQ Scores. In Exercises 5 8, find the area of the shaded region. The graphs depict IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Use Table A /8. IQ Scores. In Exercises 5 8, find the area of the shaded region. The graphs depict IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Use TI calculator. x = 75 gives z = (75 100) / 15 = 1.67; x = 110 gives z = ( ) / 15 = 0.67 Area to left of z = 1.67 is ; z = 0.67 gives area of Thus, shaded region is = P(75 < x < 110) = by using Table A 2. 5

6 278/10. IQ Scores. In Exercises 9 12, find the indicated IQ score. The graphs depict IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Use TI calculator. 278/12. IQ Scores. In Exercises 9 12, find the indicated IQ score. The graphs depict IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Use TI calculator. IQ Scores. In Exercises 13 20, assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). (Hint: Draw a graph in each case.) 278/14. Find the probability that a randomly selected adult has an IQ greater than (the requirement for membership in the Mensa organization). Use TI calculator. IQ Scores. In Exercises 13 20, assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). (Hint: Draw a graph in each case.) 278/16. Find the probability that a randomly selected adult has an IQ between 110 and 120 (referred to as bright normal). Use TI calculator. About 1.79% of adults meet the requirements for membership in the Mensa organization. x = 110 gives z = ( ) / 15 = 0.67; x = 120 gives z = ( ) / 15 = 1.33 Area to left of z = 0.67 is ; z = 1.33 gives area of Thus, shaded region is = P(110 < x < 120) = by using Table A 2. 6

7 IQ Scores. In Exercises 13 20, assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). (Hint: Draw a graph in each case.) 279/18. Find the first quartile Q 1, which is the IQ score separating the bottom 25% from the top 75%. Use TI calculator. The above Excel program is available through Important Links webpage, Technology, Normal Distribution (xls). IQ Scores. In Exercises 13 20, assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). (Hint: Draw a graph in each case.) 279/20. Find the IQ score separating the top 37% from the others. Use TI calculator. In Exercises 21 26, use this information (based on data from the National Health Survey): Men s heights are normally distributed with mean 69.0 in. and 279/22. Doorway Height The Gulfstream 100 is an executive jet that seats six, and it has a door way height of 51.6 in. a. What percentage of adult men can fit through the door without bending? b. What percentage of adult women can fit through the door without bending? c. Does the door design with a height of 51.6 in. appear to be adequate? Why didn t the engineers design a larger door? d. What doorway height would allow 60% of men to fit without bending? Very few (about %) men can fit through the door without bending. 7

8 In Exercises 21 26, use this information (based on data from the National Health Survey): Men s heights are normally distributed with mean 69.0 in. and 279/22. Doorway Height The Gulfstream 100 is an executive jet that seats six, and it has a door way height of 51.6 in. a. What percentage of adult men can fit through the door without bending? b. What percentage of adult women can fit through the door without bending? c. Does the door design with a height of 51.6 in. appear to be adequate? Why didn t the engineers design a larger door? d. What doorway height would allow 60% of men to fit without bending? Women μ = 63.6 and σ = 2.5 In Exercises 21 26, use this information (based on data from the National Health Survey): Men s heights are normally distributed with mean 69.0 in. and 279/22. Doorway Height The Gulfstream 100 is an executive jet that seats six, and it has a door way height of 51.6 in. a. What percentage of adult men can fit through the door without bending? b. What percentage of adult women can fit through the door without bending? c. Does the door design with a height of 51.6 in. appear to be adequate? Why didn t the engineers design a larger door? d. What doorway height would allow 60% of men to fit without bending? (c) Yes, the door design is probably adequate because almost everyone has to bend; therefore, it probably does not present a danger. It maybe as large as possible for the Gulfstream 100. (d) In order for 60% (area to the left is 0.60) of the men to enter without bending, the door height would have to be at least 69.7 inches as shown in the TI results below Very few (about %) women can fit through the door without bending. In Exercises 21 26, use this information (based on data from the National Health Survey): Men s heights are normally distributed with mean 69.0 in. and 279/24. Tall Clubs International Tall Clubs International has minimum height requirements for men and women. a. If the requirements are changed so that the tallest 4% of men are eligible, what is the new minimum height for men? b. If the requirements are changed so that the tallest 4% of women are eligible, what is the new minimum height for women? In Exercises 21 26, use this information (based on data from the National Health Survey): Men s heights are normally distributed with mean 69.0 in. and 279/25. U. S. Army Height Requirements for Women The U. S. Army requires women s heights to be between 58 in. and 80 in. a. Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join the Army because they are too short or too tall? b. If the U. S. Army changes the height requirements so that all women are eligible except the shortest 1% and the tallest 2%, what are the new height requirements? 8

9 In Exercises 21 26, use this information (based on data from the National Health Survey): Men s heights are normally distributed with mean 69.0 in. and 279/26. Marine Corps Height Requirement for Men The U. S. Marine Corps requires that men have heights between 64 in. and 80 in. a. Find the percentage of men who meet the height requirements. Are many men denied the opportunity to become a Marine because they do not satisfy the height requirements? b. If the height requirements are changed so that all men are eligible except the shortest 3% and the tallest 4%, what are the new height requirements? The height requirements for shortest 3% (0.03 area to the left) is 63.7; for the tallest 4% (0.04 area to the right) is (rounded to one decimal place) 280/30. Aircraft Seat Width Engineers want to design seats in commercial aircraft so that they are wide enough to fit 99% of all males. (Accommodating 100% of males would require very wide seats that would be much too expensive.) Men have hip breadths that are normally distributed with a mean of 14.4 in. and a standard deviation of 1.0 in. (based on anthropometric survey data from Gordon, Clauser, et al.). Find. That is, find the hip breadth for men that separates the smallest 99% from the largest 1%. 280/32. Sitting Distance A common design requirement is that an item (such as an aircraft or theater seat) must fit the range of people who fall between the 5th percentile for women and the 95th percentile for men. If this requirement is adopted, what is the minimum sitting distance and what is the maximum sitting distance? For the sitting distance, use the buttock to knee length. Men have buttock to knee lengths that are normally distributed with a mean of 23.5 in. and a standard deviation of 1.1 in. Women have buttock to knee lengths that are normally distributed with a mean of 22.7 in. and a standard deviation of 1.0 in. 9

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