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[DOC File]Z-Score Practice Worksheet
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a) What percent of the bottles are under-filled if the standard deviation is 2 ml? b) What percent of the bottles are under-filled if the standard deviation is 4 ml? 11. A grading scale is set up for 1000 students’ test scores. It is assumed that the scores are normally distributed with a mean score of 75 and a standard deviation of 15
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Percentiles and Z scores - Texas Instruments
The above figure shows that if you know the mean, M and the standard deviation, σ, of a distribution, you can convert any score to a Z score and then you can determine the percentages of persons within specific ranges of values. Below are some popular ranges . . . Finding different percentages …
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[DOC File]Percentages: The most useful statistics ever invented
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13. In a field, the heights of sunflowers are normally distributed with a mean of 72 inches and standard deviation of 4 inches. Find the corresponding percentile and x-value for a sunflower that has a z-score of 1.6. 14. The shoe sizes of a men’s basketball team are normally distributed with a mean of 11.5 and a standard deviation of 1.25.
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[DOC File]Normal Curve Percentages
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Since a percentage is simple to calculate (much simpler than, say, a standard deviation, the formula for which has 11 symbols!), you would think that it is also simple to interpret. Not so, as this chapter will now show. Small base. It is fairly common to read a claim such as “66 2/3 % …
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[DOC File]Chapter 17: Descriptive Statistics
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A patient recently diagnosed with Alzheimer’s disease takes a cognitive abilities test and scores a 45. The mean on this test is 52 and the standard deviation is 5. What is the patient’s percentile rank? 8.1%. A fifth grader takes a standardized achievement test (mean = 125, standard deviation …
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68–95–99.7 rule - Wikipedia
With normally distributed data, we know that (rounded to the nearest percent) precisely 68% of the data fall within one standard deviation of the mean, and precisely …
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[DOC File]Topic 6: Standard Scores
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That is, if the data are normally distributed, 68% of the cases will fall within one standard deviation, 95% of the cases will fall within two standard deviations, and 99.7% of the cases will fall within three standard deviations of the mean.
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Percentages for standard deviation