Question

a nurse's null hypothesis is that if sedentary patients and 30 minutes of cardiovascular exercise per day, it will not affect their quality o life ratings. The nurse conducts a resarh study and concludes that, indeed, adding 30 minutes of cardiovascular exercise per day does not affect quality of life ratings. Imagine that, in reality, sedentary patients greatly improve their quality of life by adding 30 minutes of cardiovascular exercise per day. The nurse is_____________

1. committing a type I error

2. committing a type II error

3. correctly rejecting the null

4. correctly failing to reject the null

Answer 1

Here null hypothesis is

H0: 30 minutes of cardiovascular exercise per day, will not affect their quality of life ratings.

and

H1:30 minutes of cardiovascular exercise per day, will affect their quality of life ratings.

Here

he nurse concludes that, indeed, adding 30 minutes of cardiovascular exercise per day does not affect the quality of life ratings but in reality, sedentary patients greatly improve their quality of life by adding 30 minutes of cardiovascular exercise per day

So she is not rejecting H0 when H1 is true.

So she is committing type 2 error.

Answer : 2. committing a type II error

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