For an independent samples t-test, list the 3 assumptions underlying the statistical test.

A researcher was interested in comparing the number of campus recreation visits during the semester for STEM/Science undergraduate majors versus non-STEM/Science undergraduate majors. From a computer database that had divided the undergraduate population into STEM/Science undergraduate majors and non-STEM/Science undergraduate major, the researcher randomly selected 100 STEM/Science undergraduate majors and randomly selected 100 non-STEM/Science undergraduate majors, and then obtained data records for the number of campus recreation visits during the Fall term. What statistical technique would the researcher use to test the null hypothesis?

A researcher was interested in comparing the number of campus recreation visits during the semester for STEM/Science undergraduate majors versus non-STEM/Science undergraduate majors. From a computer database that had divided the undergraduate population into STEM/Science undergraduate majors and non-STEM/Science undergraduate major, the researcher randomly selected 100 STEM/Science undergraduate majors and randomly selected 100 non-STEM/Science undergraduate majors, and then obtained data records for the number of campus recreation visits during the Fall term. How many degrees of freedom would this statistical test have?

The computed t-ratio from an independent t-test will always be positive. 

Extra Credit – No Penalty for Trying If a researcher has a nominal/categorical variable like Sport Participated In (Swimming, Basketball, Track, Soccer), what is meant when a researcher creates “dummy variables” to represent this variable?  What is a dummy variable?

What type of hypothesis is the following: VO2 Max is not related to Running speed.

A researcher developed an intervention designed to increase the grip strength of adults 85 years or older.  The researcher randomly selected 16 older adults and used available body mass index (BMI) data, to create 8 matched pairs on BMI. Within each pair, the researcher randomly assigned 1 participant to the intervention and 1 to the control group. The strength training program was implemented for 10 weeks (1 training session/week).  Immediately following the intervention, all adults were tested for grip strength.  Higher scores represent greater grip strength. What effect will increasing the number of matched pairs (instead of 8 pairs having 80 pairs) have on statistical power?

Using the correlation matrix below, what is the correlation between CMJump and Squad bin?

A researcher was interested in evaluating an intervention that would impact body mass. The researcher was also interested in evaluating if there were sex differences in body mass. The researcher recruited 10 males and 10 females for the study. For the 10 males, 5 males were randomly assigned to the intervention and 5 males were randomly assigned to a control condition. Similarly, for the 10 females, 5 females were randomly assigned to the intervention and 5 females were randomly assigned to a control condition. Based on the information provided, what statistical technique produced the table above?

Power can range from -1 to +1.