Pooled t By Hand
A researcher samples customers of an Amsterdam pizza restaurant: 20 who visit at the weekend and 20 different customers who visit on weekdays.
| Group | n | mean spend (euro) | sd (euro) |
|---|---|---|---|
| Weekend visitors | 20 | 78 | 22 |
| Weekday visitors | 20 | 67 | 20 |
Spending is approximately normal and the two population variances may be taken as equal. Compute the pooled two-sample t statistic for the weekend minus weekday difference in mean spend.
Answer format: round to 3 decimal places.
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