1. An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F. Each treatment combination had 3 repetitions. The degrees of freedom for error are
A. 18.
B. 13.
C. 12.
2. An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F. SPSS partial output is below.
![1286_13-35.gif](https://mywordsolution.com/CMSImages/1286_13-35.gif)
The pooled estimate of s is
A. 65.528.
B. 28.042.
C. 8.095.