Making conclusions about slope

Leonard took a random sample of his recent text messages and found a positive linear relationship between how many minutes he took to reply and how many minutes the other person took to reply. Here is computer output from a least-squares regression analysis on his sample:

Leonard wants to test $\text{H}_0\text{: } \beta=0$start text, H, end text, start subscript, 0, end subscript, start text, colon, space, end text, beta, equals, 0 vs. $\text{H}_\text{a}\text{: } \beta\neq0$start text, H, end text, start subscript, start text, a, end text, end subscript, start text, colon, space, end text, beta, does not equal, 0. Assume that all conditions for inference have been met.