We are more likely to declare two populations to be different if

We are more likely to declare two populations to be different if
 
  a. the means of our samples are very different.
  b. the variability of our samples is very large.
  c. the samples are normally distributed.
  d. all of the above

Question 2

Another name for sampling error is
 
  a. variability due to chance.
  b. error variance.
  c. constancy.
  d. both a and b

Question 3

In hypothesis testing our job would be much easier if
 
  a. sample statistics accurately reflected population parameters.
  b. subjects didn't vary so much from one another.
  c. we knew the population values.
  d. all of the above

Question 4

In testing hypotheses we have to take into account
 
  a. sample means.
  b. random variability.
  c. differences from one set of data to another.
  d. all of the above