c. Find the probability that a randomly selected adult has an IQ between 90 and 110 (referred to as the normal range).
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1 c. Find the probability that a randomly selected adult has an IQ between 90 and 110 (referred to as the normal range). d. Find the probability that a randomly selected adult has an IQ between 110 and 120 (referred to as bright normal). e. Find P 30, which is the IQ score separating the bottom 30% from the top 70%. f. Find the first quartile Q 1, which is the IQ score separating the bottom 25% from the top 75%. g. Find the third quartile Q 3, which is the IQ score separating the top 25% from the others. CREATED BY SHANNON MARTIN GRACEY 111
2 h. Find the IQ score separating the top 37% from the others. FINDING VALUES FROM KNOWN AREAS 1. Don t confuse and. Remember, are along the scale, but are under the. 2. Choose the correct of the. A value separating the top 10% from the others will be located on the side of the graph, but a value separating the bottom 10% will be located on the side of the graph. 3. A must be whenever it is located in the half of the distribution. 4. Areas (or ) are or values, but they are never. Always use graphs to!!! STEPS FOR FINDING VALUES USING TABLE A-2: 1. Sketch a distribution curve, enter the given or in the appropriate of the, and identify the being sought. 2. Use Table A-2 to find the corresponding to the area bounded by. Refer to the of Table A-2 to CREATED BY SHANNON MARTIN GRACEY 112
3 find the area, then identify the corresponding. 3. Solve for as follows: 4. Refer to the of the to make sure that the solution makes! Example: Engineers want to design seats in commercial aircraft so that they are wide enough to fit 99% of all males. Men have hip breadths that are normally distributed with a mean of 14.4 inches and a standard deviation of 1.0 inch. Find the hip breadth for men that separates the smallest 99% from the largest 1 % (aka P 99 ). 6.5 THE CENTRAL LIMIT THEOREM Key Concept In this section, we introduce and apply the. The central limit theorem tells us that for a with distribution, the of the approaches a CREATED BY SHANNON MARTIN GRACEY 113
4 as the sample size. This means that if the sample size is enough, the of can be approximated by a, even if the original population is normally distributed. If the original population has and, the of the will also be, but the of the will be, where is the size. It is essential to know the following principles: 1. For a with any, if, then the sample means have a that can be approximated by a distribution, with mean and standard deviation. 2. If and the original population has a distribution, then the have a distribution with mean and standard deviation. 3. If and the original population does not have a distribution, then the methods of this section. NOTATION If all possible of size are selected from a population with mean and standard deviation, the mean of the is denoted by, so =. Also, the standard CREATED BY SHANNON MARTIN GRACEY 114
5 deviation of the sample means is denoted by, so =. is called the of the mean. APPLYING THE CENTRAL LIMIT THEOREM Example 1: Assume that SAT scores are normally distributed with mean 1518 and standard deviation 325. a. If 1 SAT score is randomly selected, find the probability that it is between 1440 and b. If 16 SAT scores are randomly selected, find the probability that they have a mean between 1440 and c. Why can the central limit theorem be used in part (b) even though the sample size does not exceed 30? CREATED BY SHANNON MARTIN GRACEY 115
6 Example 2: Engineers must consider the breadths of male heads when designing motorcycle helmets. Men have head breadths that are normally distributed with a mean of 6.0 inches and a standard deviation of 1.0 inch. a. If one male is randomly selected, find the probability that his head breadth is less than 6.2 inches. b. The Safeguard Helmet company plans an initial production run of 100 helmets. Find the probability that 100 randomly selected men have a mean head breadth of less than 6.2 inches. c. The production manager sees the result from part (b) and reasons that all helmets should be made for men with head breadths less than 6.2 inches, because they would fit all but a few men. What is wrong with that reasoning? CREATED BY SHANNON MARTIN GRACEY 116
FINDING VALUES FROM KNOWN AREAS 1. Don t confuse and. Remember, are. along the scale, but are
h. Find the IQ score separating the top 37% from the others. FINDING VALUES FROM KNOWN AREAS 1. Don t confuse and. Remember, are along the scale, but are under the. 2. Choose the correct of the. A value
CREATED BY SHANNON MARTIN GRACEY 107 STATISTICS GUIDED NOTEBOOK/FOR USE WITH MARIO TRIOLA S TEXTBOOK ESSENTIALS OF STATISTICS, 4TH ED.
c. Between 1.00 and 3.00 e. Greater than 3.68 d. Between -2.87 and 1.34 USING THE TI-84 CREATED BY SHANNON MARTIN GRACEY 107 FINDING z SCORES WITH KNOWN AREAS 1. Draw a bell-shaped curve and the under
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