A Study Examined the Effect of Protein Consumption on Weight $$\begin{array}{l}\begin{array} { l l } \text { Low-Protein Diet}&\text { High-Protein Diet}\\101.3(20.6)&127.5(21.1)\end{array}\end{array}$$

Multiple Choice

A study examined the effect of protein consumption on weight gain in rats. Investigators obtained 14 female rats and randomly assigned 7 of them to a low-protein diet and the other 7 in a high-protein diet. After 60 days, the weight gained by each rat was recorded (in grams) . Here are the summary findings, displayed as "mean (standard deviation) ":
$$\begin{array}{l}\begin{array} { l l } \text { Low-Protein Diet}&\text { High-Protein Diet}\\101.3(20.6) &127.5(21.1) \end{array}\end{array}$$ Which of the following statements would lead us to believe that the t procedures were NOT safe to use here?

A) The experiment was not double-blinded.
B) The distributions of the data were skewed or had outliers.
C) The population standard deviations were not known.
D) The t procedures are always safe to use in a randomized experiment.