Midterm 3 (Fall 2004)

# Midterm 3 (Fall 2004) - A survey of 500 students 298...

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Statistics Test 3 Prof. VanderHoff FALL 2004 All work must be shown on exam to receive credit. 1. [15] Test the hypothesis the means of groups 1 and 2 are equal. Use .05 significance level and a two tail test. Group 1 Group 2 mean 35 33 variance 16 21 Sample size 55 42 2. [9] Test the hypothesis that the proportion of students who like stats=.45 [alternative hypothesis: p>.45]. Use .05 significance level. In a survey of 100 students, 51 students like statistics. 3. [9] Test the null hypothesis that the mean is greater than or equal to 25. Use .05 significance level, a one tail test and the following data: sample size=47; sample mean=23; sample st. dev.=5. 4. [10] calculate a 95% confidence interval for the proportion of students who voted for Bush. A sample of 75 students had 42 Bush supporters. 5. [9] Test the hypothesis that the proportion of students who like to watch volleyball=.55. Use a .01 significance level and a two tail test.

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Unformatted text preview: A survey of 500 students, 298 students like volleyball. 6. [15] Test the hypothesis that the mean before equals the mean after. Use .05 significance level and the following data: Student before after 1 17 10 2 19 7 3 12 9 4 30 21 5 45 46 6 29 23 7. [9] Test the null hypothesis that the mean is less than or equal to 13. Use .05 significance level, a one tail test and the following data: sample size=25; sample mean=16; The population standard deviation=7. 8. [9] Test the null hypothesis that the mean=57. Use a .05 significance level, a two tail test and the following data: sample size=97; sample mean=55; sample st. dev.=8. 9. [15] Test the hypothesis that the proportion of econ majors and the proportion of nursing majors who voted for Bush are equal. Use .05 significance level and a two tail test. major Voted for Bush students econ 21 29 nursing 12 32...
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Midterm 3 (Fall 2004) - A survey of 500 students 298...

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