Question 1

A study found that fewer than 100 patients were very satisfied with their hospital stay after a hip-replacement surgery. This is an example of which type of hypothesis?

Accepted Answer

This is an example of an alternative hypothesis because it demonstrates a difference between the variables being examined. The null hypothesis would be that patients were not satisfied with their hospital stay.

Question 2

The plus or minus number that is added to (and subtracted from) the result that you have calculated is referred to as what?

Accepted Answer

The plus or minus number that is added to (and subtracted from) the result that you have calculated is referred to as the confidence interval.

Question 3

If you accept the null that it is not raining and it is actually raining, then you have made which type of error?

Accepted Answer

A type II error was made because you failed to reject the null hypothesis when the alternative hypothesis was true.

Question 4

If you reject the null that it is not raining when in reality it actually is not raining, then you have committed which type of error?

Accepted Answer

A type I error was made because you rejected the null hypothesis when it is really true.

Question 5

The ______ hypothesis states that there is no difference between the variables being studied.

Accepted Answer

The null hypothesis states that there is no difference between the variables being studied.

Question 6

Probabilities are expressed as numbers or percentages.

Accepted Answer

A probability is expressed as a number, often a percentage, and the symbol used is a p.

Question 7

The alpha level for a study is 0.05 and the p-value after running the data calculations was 0.02. What decision can you make?

Accepted Answer

Because the p-value was less than the alpha of 0.05, you reject the null hypothesis in favor of the alternative hypothesis.

Question 8

Most confidence levels are set to what percentage?

Accepted Answer

Most confidence levels are set to either 95% or 99%.

Question 9

A correlation of _____ would mean that a high score on one variable has an analogous low value on the opposite variable.

Accepted Answer

1.0.

Question 10

The statistical method of determining how likely a future event can be or how likely your sample represents the entire population under question is called:

Accepted Answer

Hypothesis testing is the statistical method of determining how likely a future event can be or how likely your sample represents the entire population under question.

Quiz 10: Predicting Data