QMS 202 Study Guide - Midterm Guide: Standard Error, Test Statistic, Confidence Interval
1 May 2017
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Quantitative data: (numerical data)- discrete(counting process) or continuous(measurement) ----- (mean ) Qualitative data: (categorical data)-non numerical data ----- (proportion ) X with a dash on top= sample mean x= data (from sample) n=sample size. = su(cid:373)(cid:373)atio(cid:374) therefore x = add up the data. 1-sample z interval - calculates the confidence interval for an unknown population mean when the population standard deviation is known. 2-sample z interval - calculates the confidence interval for the difference between two population means when the population standard deviations of two samples are known. 1-prop z interval - calculates the confidence interval for an unknown proportion of successes. 2-prop z interval - calculates the confidence interval for the difference between the proportion of successes in two populations. 1-sample t interval - calculates the confidence interval for an unknown population mean when the population standard deviation is unknown.
