Does Fibrolytic Enzyme Level in Feedlot Cattle Affect Cattle Weight

Multiple Choice

Does fibrolytic enzyme level in feedlot cattle affect cattle weight gain, on average? Researchers randomly assigned 20 feedlot cattle to four groups, with each group being fed a diet containing a different enzyme level. Cattle weight gain (in kilograms) was recorded over the time of the study. There was no obvious deviation from Normality for these data. The findings are summarized below:
$$\begin{array} { | l | l | l | l | } \hline \text { Enzyme level } & n & \text { mean } & \text { std. dev. } \\\hline \text { None } & 5 & 51.8 & 4.9 \\\hline \text { Low } & 5 & 55.0 & 7.8 \\\hline \text { Medium } & 5 & 67.4 & 9.6 \\\hline \text { High } & 5 & 48.8 & 7.3 \\\hline\end{array}$$ What is the alternative hypothesis for the appropriate ANOVA?

A) The population mean weight gain is the same for all four feed conditions.
B) The population mean weight gain is different for each of the four feed conditions.
C) The population mean weight gain is not the same for the four feed conditions.
D) The population mean weight gain is highest with a medium enzyme level.