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[DOCX File]www.avon-schools.org
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Z-Scores, Confidence Intervals, Period _____ _ Drawing Conclusions From Data . For Exercises 1-2, find (a) the sample proportion, (b) the margin of error, and (c) the 95% confidence interval for the population proportion. Express your answers as a percent to the nearest tenth. 1.
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[DOC File]Topic 15:
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c) Calculate the z-score for a birth weight of 2500 grams. d) Look up this z-score in Table II to determine the proportion of babies born with a low birth weight. e) You can also use your calculator to find the proportion of observations below a particular value in a normal distribution: Hit [2nd] [VARS] and select the command normalcdf
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[DOCX File]University of Arizona
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Sampling Distribution of a Sample Proportion. If . X is the number of successes in n trials, then X . has a binomial distribution. provided that the population is much larger than . n . so that the number of successes in successive trials are independent. The population needs to be 10 times larger than the sample size. However, the proportion
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[DOC File]Z-Score Practice Worksheet
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Z-Score Practice Worksheet Name _____ A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to each of the following values: A score that is 20 points above the mean. z=2. A score that is 10 points below the mean. z=-1 . A score that is 15 points above the mean z…
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[DOC File]Section 1
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Use the standard Normal distribution to calculate the proportion of values in a specified range and to determine a z-score from a percentile. Given that a variable has the Normal distribution with mean ( and standard deviation (, use Table A and your calculator to. determine the proportion of …
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[DOC File]Z-Score Practice Worksheet
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A score of 60, where the mean score of the sample data values is 40. Z=2. A score that is 30 points below the mean. z=-3. A score of 80, where the mean score of the sample data values is 30. Z=5. A score of 20, where the mean score of the sample data values is 50. Z=-3. IQ scores have a mean of 100 and a standard deviation of 16.
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[DOC File]Exam 3 Practice Questions
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27. B Use the sampling distribution of the sample proportion that you used above and the z-score. Look up 1.00 in the table. 0.8413 is listed in the table. This is the proportion less than, we want the proportion greater than so we take 1-0.8413=0.1587. 28. C ~N( p, ) when values of n, p satisfying np15 and n(1-p)15.
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[DOC File]Rossman/Chance
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(g) Indicate where the value of the observed sample proportion who leaned to the right falls in this sketch. (h) Calculate the z-score (test statistic) corresponding to the observed value of the sample proportion who leaned to the right. (Hint: Calculate a z-score by subtracting the mean and then dividing the difference by the standard deviation.)
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Z score proportion calculator