24.4 Numerical summary: Two independent means
The numerical summary should summarise both groups, but must summarise the differences between the means (since the RQ is about this difference). All this information can be found using jamovi (Fig. 24.2) or SPSS (Fig. 24.3), then compiled into a table (Table 24.2).
|Mean||Sample size||Std dev||Standard error|
|Not using phone||533.59||32||65.36||11.554|
Each time the study is repeated, the means for each group are likely to be different, and so the difference between the means is likely to be different. That is, the difference between the means has sampling variation and hence a standard error, since it varies from sample to sample.