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[DOC File]Z-Score Practice Worksheet
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How many standard deviations is that? 3.75. Convert Einstein’s IQ score to a z score. (160 – 100)/16 = 3.75. If we consider “usual IQ scores to be those that convert z scores between -2 and 2, is Einstein’s IQ usual or unusual? Unusual. Women’s heights have a mean of 63.6 in. and a standard deviation …
how to calculate variance and standard deviation

[DOC File]Descriptive Statistics, Again
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Compute the variance from the standard deviation using the square function key, and then compute the sum of squares (SS) from the variance. You can get the SS from the variance by using the following formula: SS = (s2)(n-1). Show the TA that you can obtain the standard deviation from your calculator’s functions. TA initials _____.
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[DOC File]Calculating Probability
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Mean and Variance of a discrete r.v. with probability distribution. The mean (The mean of a r.v. is also called as the . expected value.) The variances . The standard deviation = Ex. Toss a coin twice, x = # of heads. Find and . The probability distribution is . x 0 1 2 P(x) 0.25 0.5 0.25 (the number of heads we can expect to get if we toss a ...
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[DOC File]The normal distribution
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Variance (measure of dispersion of the individuals about the mean) Pop. variance: * Sample variance: The quantities (Yi - ) are called deviations. To express these measures of dispersion in the original units of observation: Pop. standard deviation: * Sample standard deviation:
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[DOC File]Describing Data - OpenTextBookStore
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A sample of 30 distance scores measured in yards has a mean of 7, a variance of 16, and a standard deviation of 4. You want to convert all your distances from yards to feet, so you multiply each score in the sample by 3. What are the new mean, median, variance, and standard deviation?
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[DOC File]Frequency Distributions and Histograms
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Variance and standard deviation: variance (population), (sample) standard deviation (population), (sample) Discrete probability distributions: mean (discrete random variable) standard deviation ... convert z to x: Sampling Distribution of : convert . to z: Hypothesis testing, unknown: , , Goodness-of …
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[DOC File]PSYC 201 - Dr
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Make sure you label the variance and the . standard deviation with the appropriate symbol. b). Convert each raw score to a standard score. X--15 18 21 22 26 28 ---3. For the following set of scores from a . sample, please. a). Calculate the mean, median, sum of squares, the variance, and the . standard deviation.
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[DOCX File]Department of Mathematics
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From table or calculator the 90th percentile for standard normal distribution is at z=1.2816. So answer is 90 + 1.2816*38 mg/dL =138.7 mg/dL Suppose that the “abnormal range” is defined to be glucose levels which are 1.5 standard deviations above the mean or 1.5 standard deviations below the mean.
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[DOC File]Name:___________________________________
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standard deviation of $3000. If 225 students are randomly selected, find the probability that their mean . fees are greater than $30500. A) 0.9938 B) 0.0045 C) 0.0054 D) 0.0062. E) 0.9946. 11) When determining the sample size for estimating a population mean for a given previously known variance
how to calculate variance and standard deviation

[DOC File]Measures of Variability
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We can, however, convert variances to values that are easier to think about, simply by using their square roots. These are called standard deviations. So the standard deviation of Distribution A is 1.58 and the standard deviation of Distribution B is 3.16.
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How to convert variance to standard deviation