Biology
a Biology Professor Claimed That the Proportions of Grades

Short Answer

Biology
A biology professor claimed that the proportions of grades in his classes are the same.A sample of 100 students showed the following frequencies: $$\begin{array} { | l | c c c c c | } \hline \text { Grade } & \mathrm { A } & \mathrm { B } & \mathrm { C } & \mathrm { D } & \text { F } \\\hline \text { Frequency } & 18 & 20 & 28 & 23 & 11 \\\hline\end{array}$$
-In a hypothesis test for the population variance,the alternate hypothesis is the population variance is less than 17.0.The significance level to be used is 0.025 and the sample size to be taken is 25.What table value should we use from the chi-square distribution?