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# Answers To Review W S

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### Answers To Review W S

1. 1. Answers to Review WS (1-7) Review for Ch 19 -22 TEST
2. 2. WS #1 <ul><li>Conditions are met. Be sure to write formulas and plug in to check. </li></ul><ul><li>Formula for confidence interval: </li></ul><ul><ul><li>Interval: (-.2146, .05462) </li></ul></ul><ul><ul><li>We are 90% confident that the difference in proportion </li></ul></ul><ul><ul><li>of those favoring the church proposal between the 25- </li></ul></ul><ul><ul><li>40 year age group and the 40 – 60 year age group is in </li></ul></ul><ul><ul><li>the interval -.21 to .05. </li></ul></ul>
3. 3. WS #2 <ul><li>Assumptions are met. </li></ul>
4. 4. WS #3 Notes: Always round up when reporting n. In this problem we had some idea what p should be. Many times we do not. If we don’t know then use 0.5 for p.
5. 5. WS #4 Fail to reject the null since p-value is greater than alpha = .05. There is no evidence to suggest that the proportion of freshmen placed on academic probabation is less than 45%. p is proportion of freshmen placed on academic probation. Assumptions are all met – be sure to write formulas and plug in values to check. Be sure to write formula!
6. 6. WS #5 <ul><li>Assumptions not met. Sample size is too small for np>10 </li></ul>
7. 7. WS #6 p1 is proportion of urban high school students who plan to pursue a post-secondary education. P2 is proportion of suburban high school students who plan to pursue a post-secondary education. Conditions are met, be sure to list and check these! Fail to reject the null since p-val is > than alpha =.05. There is no evidence to suggest that the two proportions between urban and suburban high school students who plan to pursue a post-secondary education are different.
8. 8. WS #7 P is proportion of explosives found. All conditions are met. Be sure to list and check all conditions. Fail to reject null since p-val is > alpha = .05. There is no significant evidence to suggest the hand held sensor finds explosives more than 25 percent of the time.