1. A social researcher wants to test the hypothesis that people who drink a lot while bowling have higher scores than people who do not drink while they bowl. The researcher studies 50 drinking bowlers and 50 nondrinking bowlers. The average score for drinking bowlers was 142 with a standard deviation of 7.45. The average score for nondrinking bowlers was 134 with a standard deviation of 6.81.
In words: What are your conclusions about the null hypothesis?
2. A social researcher wants to test the hypothesis that people who drink a lot while bowling have higher scores than people who do not drink while they bowl. The researcher studies 50 drinking bowlers and 50 nondrinking bowlers. The average score for drinking bowlers was 142 with a standard deviation of 7.45. The average score for nondrinking bowlers was 134 with a standard deviation of 6.81.
Are your results significant at the .05 level?
Yes
No
3. A social researcher wants to test the hypothesis that people who drink a lot while bowling have higher scores than people who do not drink while they bowl. The researcher studies 50 drinking bowlers and 50 nondrinking bowlers. The average score for drinking bowlers was 142 with a standard deviation of 7.45. The average score for nondrinking bowlers was 134 with a standard deviation of 6.81.
What are your degrees of freedom?
4. A social researcher wants to test the hypothesis that people who drink a lot while bowling have higher scores than people who do not drink while they bowl. The researcher studies 50 drinking bowlers and 50 nondrinking bowlers. The average score for drinking bowlers was 142 with a standard deviation of 7.45. The average score for nondrinking bowlers was 134 with a standard deviation of 6.81.
Calculate obtained t: t = __________ .
5. A social researcher wants to test the hypothesis that people who drink a lot while bowling have higher scores than people who do not drink while they bowl. The researcher studies 50 drinking bowlers and 50 nondrinking bowlers. The average score for drinking bowlers was 142 with a standard deviation of 7.45. The average score for nondrinking bowlers was 134 with a standard deviation of 6.81.
In words: a ) What would be the null hypothesis? b) What is the research hypothesis?
6. A sample of 60 convicted burglars revealed that the average number of homes they burglarized was 40 with a standard deviation of 15. Calculate the 99% confidence interval.
7. A sample of 60 convicted burglars revealed that the average number of homes they burglarized was 40 with a standard deviation of 15. Calculate the 95% confidence interval.
8.Assuming we know that the population standard deviation (σ) on a given measure ofpsychotic behavior is 14, and we have 50 cases available for our assessment, calculate thestandard error.
9. In a t test of the difference between means, when we accept the null hypothesis, we ______ .
a. 
Have committed a Type 2 error 

b. 
Have obtained a tvalue greater than our critical tvalue 

c. 
Conclude that the difference is not statistically significant 

d. 
Claim that a significant difference exists between groups 
10. A researcher samples 50 students and calculates a mean GPA of 2.8. He claims with 95% confidence that the mean GPA of the whole university student body is 2.8. This means that ______ .
a. 
There are 68 chances out of 100 that the mean GPA of the whole university is 2.8. 

b. 
There are 5 chances out of 100 that the mean GPA of the whole university is not 2.8. 

c. 
There are 95 chances out of 100 that the mean GPA of the whole university is not 2.8. 

d. 
There are 10 chances out of 100 that the mean GPA of the whole university is not 2.8. 
: Average score for drinking bowlers
: The average score for nondrinking bowlers
To Test :
H_{0} :
H_{1} :
Test Statistic :
t = 5.6045
Test Criteria :
Reject null hypothesis if
DF = 97
t_{\alpha, DF} = t_{ 0.05 , 97 } = 1.661
Result : Reject Null Hypothesis
Are your results significant at the .05 level?
Yes, there is sufficient evidence to support the claim that people who drink a lot while bowling have higher scores than people who do not drink while they bowl.
What are your degrees of freedom?
DF = 97
Calculate obtained t: t = __________ .
t = 5.6045
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