Instructions: In each row, select the word(s) to identify the null hypothesis.
How do three age groups compare with respect to blood pressure?
Null hypothesis: Zero the difference between group means.
Does blood pressure (Y) increase with hours of exercise (X)?
Null hypothesis: The slope of the line is .
Does an ancient coin give a fair flip?
Null hypothesis: The probability of "heads" one half.
Are blood type and gender related?
Null hypothesis: of the two variables.