STAT 200 Lecture Notes - Lecture 8: Confidence Interval, Statistical Hypothesis Testing, Sampling Distribution
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Stat 200. 201 elementary statistics - lecture 8: parameter v. statistic. Identify three factors that affect the width (precision) of the confidence interval (size of margin error) Generalize conclusions from the sample to the population. The value can be evaluated from sample. One population has multiple answers from different samples. Population is fixed at p= . 70 but there"s no way we know that. P-hat plusminus z square root (p-hat(1-p-hat)/n) in notebook. Z* multipliers: levels of confidence come from normal distribution. So use chart based on level of confidence and find z* 3: 95% confidence interval for population proportion who believe in grade inflation. Sample estimate plus minus margin of error. P hat plus-minus z* square root (p-hat(1- p-hat))/ n. The difference between the unknown population proportion and the sample proportion is x will be within x of __ confidence. We have 95% confident that the unknown proportion bla blah blah problem is between . 32 to . 40.
