Chapter 3, Table 1, Using SPSS Statistics

A One Sample t-test With SPSS Statistics

The data set analyzed to replicate Chapter 3 Table 1 consists of IQ (WISC-R) measurements on six hyperactive children. The question of interest is: “are hyperactive children in the school district brighter than the average student?” The mean IQ among the students is known to be 98. Thus, the null hypothesis in this situation is that the population mean for the hyperactive students is also 98.

To answer such a question we perform a one sample t-test specifying the null hypothesis as 98. Because a t-value squared with X degrees of freedom is equivalent to an F value with one numerator and X denominator degrees of freedom, our results are equivalent to those reported in the book. Recall that the observed F-value (with 1 and 5 degrees of freedom) in the book is 9, whereas our t-value (with 5 degrees of freedom) is 3.

1. Click Analyze, then Compare Means, then One Sample t-test.

The One-sample t-test procedure.

2. From the pop-up menu within the One Sample t-test option, the Test Value represents the value of the null hypothesis of interest.

The value of 98 is specified because it is the null value being evaluated.

3. Click OK to obtain the results.