1. Test Whether the absence is uniformly distributed over the week. A product is classified as \( 1^{\text {st }} \), \( 2^{\text {nd }}, 3^{\text {rd }}, 4^{\text {th }} \) grade. The past performance of the plant shows, that the respective proportions are 8:4:2:1. As a check on the run of the plant, 600 parts were examined and classified as follows. Is there any evidence of a change \( n \) production standard.
\begin{tabular}{|l|l|l|l|l|l|}
\hline Grade & 1 & 2 & 3 & 4 & Total \\
\hline Frequency & 340 & 130 & 100 & 30 & 600 \\
\h
