215 Handout_7(chap 10) - Handout #7: Confidence Interval...

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                          Handout #7: Confidence Interval for Population Proportions STA215: Introductory Applied Statistics Dr. Jann-Huei Jinn General form of confidence interval (C.I.) for population parameter : Sample estimate ± Margin of Error Steps to describing a Confidence Interval: 1. Population parameter of interest Identify the name of the parameter (e.g. μ or P) and the underlying population. 2. Assumptions a) the sample given is an SRS (simple random sample) from the population b) the population distribution of the variable measured is roughly normal or sample size is large enough (n 30). 3. Level of confidence Choose the level of confidence (usually 90%, 95% or 99%, see Table 10.1, page 412) 4. Point estimate, and Standard error e.g. Point estimate: x or p ˆ Standard error of statistics 5. Construct the confidence interval Find * z or t* then use the appropriate formulas. 6.
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215 Handout_7(chap 10) - Handout #7: Confidence Interval...

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