Midterm 3 (Spring 2005)

# Midterm 3 (Spring 2005) - Use a significance level of.05 A...

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Statistics Test 3 Prof. VanderHoff SPRING 2005 All work must be shown on exam to receive credit. 1. [10] Test the hypothesis that the proportion of students who will take another stats class=.6. Use .05 significance level and a two tail test. A survey of 25 students indicates 21 will take another stat class. 2. [15] Test the hypothesis that the proportions of students from Essex county is .2, from Union is .1, from Bergen is .3 and from other counties is .4. Use .05 significance level and the following data: county count Essex 5 Bergen 9 union 31 Other 35 3. [15] Test the hypothesis that the mean before treatment equals the mean after treatment. Use .05 significance level and the following data from 5 patients: patient before after 1 17 12 2 22 20 3 16 13 4 23 19 5 15 14

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4. [10] Do cars driven by students average more than 25 miles to a gallon of gas? Test the null hypothesis the MPG is less than or equal to 25.
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Unformatted text preview: Use a significance level of .05. A sample 0f 16 students has an average MPG=28 and a variance=18. 5. [15] Test the null hypothesis that the mean for NY greater than or equal to the mean for NJ. Use .05 significance level, a one tail test and the following data: NY NJ Mean 52 54 var 81 100 N 49 81 6[15] Test the hypothesis that the proportion of voters in Red states who support Social Security reform equals the proportion of voters in Blue states who support Social Security. . Use .05 significance level, a two tail test and the following data: number Blue Red voters 50 60 Support SS reform 30 45 7. [20] Are the means for majors in Economics, Business and Nursing the same? Test the hypothesis the means are equal. Use .05 significance level .and the following data. econ business nursing mean 35 42 37 var 25 26 17 n 25 25 25...
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