A researcher was interested in stress levels of lecturers during lectures. She took the same group of eight lecturers and measured their anxiety (out of 15) during a normal lecture and again in a lecture in which she had paid students to be disruptive and misbehave. Based on the SPSS output, how would you interpret these results?  

Which of the following are assumptions underlying the use of parametric tests?

Why are z-scores used to check for outliers?

Comparing Two Means

In a t-test to determine whether analgesia or a placebo provide pain relief, the t-value obtained for the two-tailed probability p is found to be a low number at p = .042. What can be deduced about this result?

  Which of the following key word(s) best describe the type of variable Number of children group? Select ALL answers that apply. 

Which of the above variable(s) are classified as nominal variable(s)? Select ALL answers that apply. 

Which of the above variable(s) are classified as discrete variable(s)? Select ALL answers that apply. 

The table below shows three variables that have been transformed or recoded. Age was log-transformed, LDL (Low Density Lipoprotein) was put into different groups according to clinical guidelines and Number of children was recoded. The data type of these three newly transformed variables may be different from the original variable. Answer the following questions.  

 Which of the following are measures of dispersion? Select ALL answers that apply.