MATH221 Graded week 7 quiz

MATH221 Graded week 7 quiz - There are 2 pages in this...

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There are 2 pages in this exam: Page: 1 2 1. Question: (TCO 6) In the standard normal distribution, the standard deviation is always Your Answer: 0 1 ( Ch 5: By definition, the standard deviation = 1. ) CORRECT 2 none of these Points Received: 5 of 5 2. Question: (TCO 6) The area under the standard normal curve is Your Answer: 0 1 ( Ch 5: The total area under ANY normal probability distribution is always 1. ) CORRECT 2 none of these Points Received: 5 of 5 3. Question: (TCO 6) If Mary gets a 90 on a physics test where the mean is 85 and the standard deviation is 4.59, where does she stand in relation to her classmates? Your Answer: She is in the top 15%. ( Ch 5: z = (90 – 85)/4.59 = 1.09. Area to the left is 0.8621. Thus 86.21% of test scores are below 90. ) CORRECT ANSWER She is in the bottom 15%. INCORRECT She is in the top 5%. She is in the bottom 5%. Points Received: 2 of 5 Comments: z = (90 – 85)/4.59 = 1.09. Area to the left is 0.8621. Thus 86.21% of test scores are below 90.) 4. Question: (TCO 6) In a normal distribution with mu = 25 and sigma = 6, what number corresponds to z = 3? Your Answer: 40 43 ( Ch 5: x = mu + z * sigma, so x = 43 ) CORRECT 46 none of these Points Received: 5 of 5 5. Question: (TCO 6) Let’s assume you have taken 100 samples of size 64 each from a normally distributed
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This note was uploaded on 02/24/2011 for the course MATH 221 taught by Professor Mereck during the Fall '10 term at DeVry OK City.

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MATH221 Graded week 7 quiz - There are 2 pages in this...

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