Statistics questions

I have 20 questions I’m working on. Some questions are specific to an article. I’m including the 3 articles. I have been working on these questions, and have answered 18, when I copied the questions it did not copy the answers I chose. Not sure if what I have is right. Question 6 and 12 I have not been able to figure out how to get the answer.

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Following is the link to the articles on google drive if articles can’t be 

https://drive.google.com/folderview?id=0B0MDT1WVLFkFNmgxeTVTR2cydHM&usp=sharing

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% 2.  Refer to Montgomery article. Is how heavy a child is (as measured by BMI SD score) significantly related to his or her level of physical activity (PAL) in this study? Yes No

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

4.  Refer to Montgomery article. From the correlation analyses in Figure 1, how much variability does time spent sedentary account for in PAL?

	33%
	11%
	57%
	22%

5.  Refer to Montgomery article. In the multiple regression analyses, is sex significantly related to PAL?

	Yes
	No

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%

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

8.  Refer to Montgomery article. Which variable is inversely related to PAL?

	Time spent sedentary
	Time spent in moderate activity
	Age
	None are inversely related

9.  If you wanted to determine whether the number of hours spent in class online was related to exam grades for stats students, which statistical test would you use?

	Correlation
	Dependent t-test
	Independent t-test
	ANOVA 10.  Because of its dependence on two extreme scores, the ______ is not typically a useful measure of variability. Variance Standard deviation Confidence interval Range 11.  Measures of central tendency include all of the following EXCEPT: Mean deviation Median Mean Mode 12.  Refer to Faigenbaum article. For the chest press results, which statement is correct? Chest press was significantly related to the number of days of training per week. The change in strength in the control group was not different from the 1 day group. The change in strength in the control group was not different from the 2 day group. The change in strength in the 1 day group was greater than in the control group. 13.  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. For group 1, the 4% means: The body fat measurement is 4% accurate. 68.26% of the % fat values fall between 35.4% and 39.4%. The group’s % fat did not fall below 4%. 68.26% of the % fat values fall between 33.4% and 41.4%.

14.  If you wanted to determine whether male or female stats students scored better on exams, which statistical test would you use?

	Correlation
	Dependent t-test
	Independent t-test
	ANOVA 15.  Refer to Dale article. The children on the active day had a higher activity level after school than on the restricted day. Was this difference statistically significant? Yes No

16.  From the choices below, identify the strongest correlation coefficient.

	-0.93
	0.90
	0.87
	-0.05

17.  Refer to the Dale article. What type of statistical test was used in Table 2 to determine whether children on restricted days versus non-restricted days had a different activity level after school?

	Correlation
	Dependent t-test
	Independent t-test
	ANOVA

18.  If you wanted to determine whether the class’s test grades improved from the midterm to the final exam for stats students, which statistical test would you use?

	Correlation
	Dependent t-test
	Independent t-test
	ANOVA

19.  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. If you wanted to determine whether the two groups differed significantly in their % fat, the appropriate statistical test is:

	ANOVA
	Independent t-test
	Dependent t-test
	Correlation

20.  Type I errors are made when, based on the results of a study, the researcher:

	Correctly concludes that the intervention was effective
	Incorrectly concludes that the intervention was effective
	Correctly concludes that the intervention was not effective
	Incorrectly concludes that the intervention was not effective

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