Litter sizes (number of pups) for randomly chosen dogs from two breeds were compared. The sample data were entered into Excel, and the following results were produced. $$\begin{array}{l}
\text { t-Test: Two-Sample Assuming Unequal Variances }\
\begin{array} { l r r }
\hline & \text { Dalmation } & \text { Labrador } \
\hline \text { Mean } & 4.8125 & 5.461538 \
\text { Variance } & 3.4958333 & 0.602564 \
\text { Observations } & 16 & 13 \
\text { Hypothesized Mean Diff } & 0 & \
\text { df } & 21 & \
\text { t Stat } & - 1.261183 \
\hline
\end{array}
\end{array}$$ What is the critical value for a left-tailed test comparing the means at ? = .05?
A)-1.645
B)-1.721
C)-1.703
D)-1.699

Question

Litter sizes (number of pups) for randomly chosen dogs from two breeds were compared. The sample data were entered into Excel, and the following results were produced. $$\begin{array}{l}
\text { t-Test: Two-Sample Assuming Unequal Variances }\
\begin{array} { l r r } 
\hline & \text { Dalmation } & \text { Labrador } \
\hline \text { Mean } & 4.8125 & 5.461538 \
\text { Variance } & 3.4958333 & 0.602564 \
\text { Observations } & 16 & 13 \
\text { Hypothesized Mean Diff } & 0 & \
\text { df } & 21 & \
\text { t Stat } & - 1.261183 \
\hline
\end{array}
\end{array}$$ What is the critical value for a left-tailed test comparing the means at ? = .05?
A)-1.645
B)-1.721
C)-1.703
D)-1.699

Quizplus · Accepted Answer

The critical value for a left-tailed test at α = .05 with 21 degrees of freedom (df) is approximately -1.721, which can be found in a t-distribution table or using statistical software. This value is specific to the degrees of freedom and the significance level of the test.

Litter Sizes (Number of Pups) for Randomly Chosen Dogs from Two