If we want to use the chi-square test to test the difference between two proportions, we should ...

If we want to use the chi-square test to test the difference between two proportions, we should
 
  a. convert the proportions to means.
  b. convert the proportions to frequencies.
  c. run a z test.
  d. either b or c

Question 2

If we want to use the chi-square test to test the difference between means we should
 
  a. convert the means to standard scores.
  b. convert the means to totals.
  c. run a different test instead.
  d. be sure the means are not too small.

Question 3

The chi-square test can run into trouble if
 
  a. the observations are not independent.
  b. the expected frequencies are too low.
  c. the total number of subjects is very small.
  d. all of the above