What was the rate of committing a type I error for the After School time period?, Statistics questions
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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.
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.
2.

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 ttest 

Independent ttest 

ANOVA 10.
11.
12.
13.

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

Dependent ttest 

Independent ttest 

ANOVA 15.

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 nonrestricted days had a different activity level after
school?
Correlation 

Dependent ttest 

Independent ttest 

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 ttest 

Independent ttest 

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 ttest 

Dependent ttest 

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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