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Statistics Questions

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1. Refer to Dale article. What was the rate of committing a type I error for the After School
time period?
1.2%
12.0%
5%
0%
Answer: The P value is always the same as the Type I error which from the table is 0.12.
Type I error = 1.2%
2. Refer to Montgomery article. Is how heavy a child (as measured by BMI SD score)
significantly related to his or her level of physical activity (PAL) in this study?
Yes
No
Answer: Yes
3. Researchers risk making a type II error when:
They conclude that means are different
They conclude that means are the same
They have too many subjects in their study
They measure too many variables in their study

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Answer: They conclude that means are the same.
4. Refer to Montgomery article. From the correlation analysis in Figure 1, how much
variability does time spent sedentary account for in PAL?
33%
11%
57%
22%
Answer: 11%
5. Refer to Montgomery article. In the multiple regression analysis, is sex significantly
related to PAL?
Yes
No
Answer: Yes
6. Refer to Montgomery article. If percent MVPA accounts for 4.8% of the variability in
PAL, how much variation does age, sex, and BMI SD score (together) account for in
PAL?
11.4%
12.0%

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1. Refer to Dale article. What was the rate of committing a type I error for the After School time period? 1.2% 12.0% 5% 0% Answer: The P value is always the same as the Type I error which from the table is 0.12. Type I error = 1.2% 2. Refer to Montgomery article. Is how heavy a child (as measured by BMI SD score) significantly related to his or her level of physical activity (PAL) in this study? Yes No Answer: Yes 3. Researchers risk making a type II error when: They conclude that means are different They conclude that means are the same They have too many subjects in their study They measure too many variables in their study Answer: They conclude that means are the same. 4. Refer to Montgomery article. From the correlation analysis in Figure 1, how much variability does time spent sedentary account for in PAL? 33% 11% 57% 22% Answer: 11% 5. Refer to Montgomery article. In the multiple regression analysis, is sex significantly related to PAL? Yes No Answer: Yes 6. Refer to Montgomery article. If percent MVPA accounts for 4.8% of the variability in PAL, how much variation does age, sex, and BMI SD score (together) account for in PAL? 11.4% 12.0% 14.8% 6.6% Answer: 6.6% (11.4% - 4.8%) 7. Consider two separate groups of people who had their body fatness measured. The mean and standard deviation for groups 1 and 2 were 37.4% ± 4 % and 38.2% ± 7%, respectively. The spread of scores is: Greater in group 1 Greater in group 2 The same in both groups Too low Answer: Greater in ...
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