Introduction

Questions

Question 1 out of 3.

Tommy claims that he blindly guessed on a 20-question true/false test, but then he got 16 of the questions correct. Using the binomial calculator, you find out that the probability of getting 16 or more correct out of 20 when \pi =.5 is 0.0059. This probability of 0.0059 is the probability that...

  • he would get 80\% correct if he took the test again.
  • he would get this score or better if he were just guessing.
  • he was guessing blindly on the test.


Question 2 out of 3.

Random assignment ensures groups will be equal on everything except the variable manipulated.

  • True
  • False


Question 3 out of 3.

The researchers hypothesized that there would be a correlation between how much people studied and their GPAs. The null hypothesis is that the population correlation is equal to

__________