1 BA 275 Quantitative Business Methods Review Statistical Inference on Two Populations The p-value Approach Practice Problems Office Hours: Monday, 2/27/06:

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1 BA 275 Quantitative Business Methods Review Statistical Inference on Two Populations The p-value Approach Practice Problems Office Hours: Monday, 2/27/06: 1:10 – 3:30 Tuesday, 2/28/06: 9:00 – 11:00 and 2:00 – 4:30 Agenda

2 Midterm Examination #2 Wednesday, 3/1/06 in class. Closed books/notes/packet/friends exam, but I will provide you The normal and the T tables The formulas on pp. 13, 14, and 17. Need a good night sleep and a calculator that WORKS! Topics: The Normal Distribution and the Central Limit Theorem Confidence Interval Estimation, Margin of Error, Sample Size Determination Hypothesis Testing, the p-value approach CyberStats: B-11, B-12, C-1, C-2, C-3, C-4, C-6, C-7, C-8.

3 Example How much time do executives spend each day reading and sending ? A survey of 162 executives was conducted and the mean time (in minutes) was minutes with a standard deviation of At 5% significance level, we concluded that the mean amount of time exceeds 60 minutes. Find the p-value.

4 Example (p.16) Do government employees take longer coffee breaks than private sector workers?

5 Example (p.16) Five months ago, a poll showed that 579 out of 908 voters in a sample supported the WaterFront project. This month, 360 out of 812 voters in a sample support the project. Is the project gaining support?