I've worked through a set of practice questions and ran across this problem and don't see how I can solve it without . Can someone please give me some direction?
Q: When someone dials 911 for an emergency, the average length of time to reach an operator is supposed to be no more than 30 seconds. However, in a recent survey of 81 such calls, the sample mean came out to be 32 seconds. Is the response time in fact too long? Use =.10
So, =30, =81, and =32.
: , and
I wanted to use the Z or T test statistics but I guess I can't because I don't see that I'm provided with enough information to be able to use them.
I really appreciate your help! I'm sure there is something basic that I'm not seeing.