SOURCEBOOK

JASP | Data Analysis

One Sample t Test

Obtaining One-Sample Inferential Statistics

  1. First, load the data file that you previously created (described elsewhere). Be sure that the data file looks as you intended.

  2. Select the “T-Tests → One Sample T-Test” option.

Obtaining the Significance Test

  1. A set of options will then appear for you to choose the variables and statistics of interest.

  2. Select the variable you wish to analyze by clicking on it in the left-hand box and then the arrow to move it into the right-hand box.

  3. Be sure to enter a known or hypothesized mean into the “Test Value” field. If you do not enter a value here, JASP will automatically use zero as the comparison mean.

  4. Output will automatically appear on the right side of the window. Output can be copied and pasted into other software for printing.

Obtaining Additional Statistics

  1. Select the options that are important for you: “Location parameter” will display the size of the difference between the two means; “Effect size” will display Cohen’s d; and “Descriptives” will offer a mean and standard deviation for the group.

  2. If you wish to view (and alter) the widths of the confidence intervals, check the relevant “Confidence Interval” boxes.

  3. Updated output will automatically appear on the right side of the window. Output can be copied and pasted into other software for printing.