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First Midterm Formula Sheet

# First Midterm Formula Sheet - EFS%— 6&0 ASK/77a...

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Unformatted text preview: EFS %— 6&0/ ASK/77a 161‘ \$987; Deﬁnition ’alq Tﬁl‘" 1: q' The number of scores in a sample. or the sample size. The number of scores in a population. or the populatioﬂ size. An individual score in either a sample or a population. The sample mean. X refers to the individual scores ill the sample. The population mean. X refers to the individual scolﬁ in the population. The sample variance. This variance is a biased estilnlle of the population variance. The sample standard deviation. This standard deviation isdescﬁpdveofthesamphbmitisnotusedtoestimate the population standard deviation. Theestimatedpopulationvariance. Thisvarianeeisan unbiased estimate of the population variance. The estimated population standard deviation. This stan- dard deviation is the formula mom frequently used to calculate the standard deviation. Unless I indicate otho erwise,itisthestandarddeviationuudinthistext. The sum of squares. The population variance. X refers to individual scores in the population. The population standard deviation. X refers to individual scores in the population. The mean of the theoretical sampling distribution of the mean. This mean is equal to the population mean. it. The mean of an empirical sampling distribution of the mean. ' The standard error of the mean for a sample of size N. The standard error of the mean is the standard deviation of the sampling distribution of the mean. The estimated standard error of the mean for a sample of size N. The standard normal deviate. This formula converts a normally distributed raw score X to a z score in the standard normal distribution. The value of :01». obtained with this formula can be used with the standard normal distribution of Table A-l. A standard score. This formula converts a raw score into a z score that describes how far above or below the sample mean the raw score is. : scores obtained using this formula cannot be used with the standard normal distribution of Table A—l. ‘I'hisformulaeonvertsasamplemeantoazscoreinthe standardnormaldisuibution. Thevalue afar-obtained withdlisforrmlacanbeusedwiththestandardnorml distribution of Table A—l. N“ ...
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