The following information was obtained from matched samples taken from two populations.Assume the population of differences is normally distributed. $\begin{array}{lll}
\text { Individual } & \text { Method 1 } & \text { Method 2 } \
1 & 7 & 5 \
2 & 5 & 9 \
3 & 6 & 8 \
4 & 7 & 7 \
5 & 5 & 6
\end{array}$
The point estimate for the difference between the means of the two populations (Method 1 - Method 2) is
A) -1.
B) 0.
C) -4.
D) 2.

Question

The following information was obtained from matched samples taken from two populations.Assume the population of differences is normally distributed. $\begin{array}{lll}
\text { Individual } & \text { Method 1 } & \text { Method 2 } \
1 & 7 & 5 \
2 & 5 & 9 \
3 & 6 & 8 \
4 & 7 & 7 \
5 & 5 & 6
\end{array}$ 
 The point estimate for the difference between the means of the two populations (Method 1 - Method 2) is
A) -1.
B) 0.
C) -4.
D) 2.

Quizplus · Accepted Answer

The point estimate for the difference between the means is the average of the differences between each pair of observations: (7-5) + (5-9) + (6-8) + (7-7) + (5-6) = 2 - 4 - 2 + 0 - 1 = -5. Dividing by the number of pairs (5), the point estimate is -5/5 = -1.

The Following Information Was Obtained from Matched Samples Taken from Two