This statement was included in a research report: A positive ...

[KWilfred]

This statement was included in a research report:
 
  A positive correlation was found between the variables of self-reported sleep adequacy and performance on the driving simulator (r = 0.21), although the correlation did not reach statistical significance. A research consumer should evaluate this to mean what?
  a. No relationship exists between the two variables.
  b. The hypothesis was supported by the data presented.
  c. The hypothesis was not supported by the data presented.
  d. The relationship between the variables is too weak to have practical application.

Question 2

Which change in the sample selection procedure of a study involving continuous handrail support, oxygen uptake,
 
  and heart rate in women during submaximal step treadmill exercise would have the greatest impact on increasing the generalizability of the results?
  a. Increasing the sample size
  b. Including subjects who smoke in the study
  c. Having a true control group rather than having subjects serve as their own controls
  d. Expanding the sample population to include equal numbers of women who were moderately fit and highly fit

[Ksh22]

Answer to Question 1

ANS: D

Feedback
A Because there is a correlation, a relationship has to exist between variables.
B No hypothesis is expressed, so no judgment can be made regarding the statement.
C No hypothesis is expressed, so no judgment can be made regarding the statement.
D The statement explains that the relationships among the variables are too weak for practical application.

Answer to Question 2

ANS: D

Feedback
A Increasing sample size does not necessarily increase the generalizability of results.
B Smoking may or may not alter women's fitness level and does not necessarily affect generalizability.
C Having a control group does not increase generalizability like increasing heterogeneity of the sample.
D Including various types of women according to fitness level would increase the generalizability of the results.