Thanks for your answer, but I am not sure how this adds up to the calculation of the website. The website says:
From the Z-table: 1.8 corresponds to .9641; p= 1 - .9641 = .036
We reject the null hypothesis since 1.8 > 1.64 (and .036 is less than 95%)...
I was hoping someone would understand this better than I do. I am trying to solve the following problem:
We are testing the hypothesis that the average gas consumption per day in Billings, Montana is greater than 7 gallons per day; we want 95% confidence.
We sample 30 drivers. The...