Homework Answers
a)
Two sided
b)
t = -0.842
t critical value are = +/- 2.160
Reject H0 if t < -2.160 or t > 2.160
Fail to reject H0
Mozart does not change the math score
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*Note: alpha = .001
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A researcher wanted to see if students will learn more effectively with a constant background sound, as opposed to an unpredictable sound or no sound at all. She randomly divides twenty-four students into three groups of eight. All students study a passage of text for 30 minutes. Those in group 1 study with background sound at a constant volume in the background. Those in group 2 study with noise that changes volume periodically. Those in group 3 study with no...
A movie theater company wants to see if there is a difference in the average price of movie tickets in Memphis and Minneapolis. They sample 25 ticket stubs from Memphis and 20 from Minneapolis. Test the claim using a 10% level of significance. Assume the population variances are unequal and that movie ticket prices are normally distributed. Give answer to at least 4 decimal places. Minneapolis Memphis 8 9 10 12 9 13 10 11 10 10 10 11 9...
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Please use this information to answer the next questions An investigation was launched to address the effectiveness of an antibacterial soup in reducing operating room contamination. The new soup was fosted in a sample of eight operating rooms in the greater Seattle res Data was collected on the level of operating room contamination her values indicate greater contaminar on in these light operating rooms before the new soap was used and after the new soap was used Output are based...
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