# One Sample t-test in SPSS

This tutorial shows how you can do one sample t-test in SPSS. One sample t-test is to compare a sample to a fixed value.

For instance, you can compare whether the average score of students’ reading is different from 45. In the following, I am going to show how you can do that in SPSS. You can download the data here.

## Step 1: Click “One-Sample T Test”

“Analyze”, then “Compare Means”, then “One-Sample T Test.”

## Step 2: Drag variable

Drag the variable “read” into the “Test Variable(s)” and type “45” into “Test Value.” Then click OK.

## Step 3: Interpret the output of One sample t-test in SPSS

The following are the null and alternative hypotheses for one sample t-test:

• Null Hypothesis: The mean of reading scores is not different from 45.
• Alternative Hypothesis: The mean of reading scores is different from 45.

The following is the output. We can see that the mean is 52.23. Further, the p-value is smaller than 0.001. Thus, we reject the null hypothesis and conclude that the mean of reading scores (i.e., 52.23) is significantly different from 45.