The Null Hypothesis

Instructions: In each row, select the word(s) to identify the null hypothesis.
  1. How do three age groups compare with respect to blood pressure?

    Null hypothesis: Zero the difference between group means.

  2. Does blood pressure (Y) increase with hours of exercise (X)?

    Null hypothesis: The slope of the line is .

  3. Does an ancient coin give a fair flip?

    Null hypothesis: The probability of "heads" one half.

  4. Are blood type and gender related?

    Null hypothesis: of the two variables.