The t test for the difference between the means of two independent populations assumes that the ...

The t test for the difference between the means of two independent populations assumes that the respective:
 
  A) sample sizes are equal.
  B) sample variances are equal.
  C) populations are approximately normal.
  D) population variances are known.

Q. 2

The probabilities that result from studying two distinct sets of events are called:
 
  A) individual probabilities.
  B) classic probabilities.
  C) bivariate probabilities.
  D) problem probabilities.

Q. 3

Percentiles are values of the variable that divide a set of ranked data into 100 equal subsets.
 
  Indicate whether the statement is true or false

Q. 4

We can describe graphically the shape of the distribution by a histogram, which can be symmetrical or asymmetrical.
 
  Indicate whether the statement is true or false