-A Correlation Coefficient Computed For $n = 18$ And $a = 0.10$

Multiple Choice

$$\begin{array}{l}\text { The western city wishes to see if there is a relationship between the summer temperature and the amount }\\\begin{array} { c c c } & \left. \operatorname { Temp } ^ { \circ } { } ^ { \circ } \mathrm { C } \right) & \text { Kilowatts, } { } ^ { y } \\& 22.7 & 680 \\& 25.5 & 760 \\& 29.4 & 910 \\& 36.6 & 1,510 \\& 38.8 & 1,170 \\& 27.2 & 837 \\\text { of electricity used (in kilowatts) . } & 24.4 & 600 \\& 40.5 & 1,800\end{array}\end{array}$$
-A correlation coefficient computed for $n = 18$ and $a = 0.10$ is $r = 0.692$ . Using the $t$ -test for the correlation coefficient, what are the critical values?

A) $\pm 2.120$
B) $\pm 2.101$
C) $\pm 1.734$
D) $\pm 1.746$