00:01
Hi, in this question we're given some data on the amount that households in baltimore and houston pay for their, well their household bills, their utility bills, and we want to perform a hypothesis test to determine if there's a difference in the mean utility bills.
00:18
So what we're going to do is we're going to use the fact that these averages, because the sample sizes are greater than 30, are approximately normal.
00:29
So, let's say xb is going to be approximately normal with a distribution of some mean mu b, and we know its standard deviation is 64, and then we divide by the number of samples, so in this case that's 33.
00:53
And then similarly for houston, it's going to be normal with some mean and a standard deviation of 58 over the square root of 36.
01:10
So then the hypothesis, right, so the null hypothesis is that the means are equal, and the alternate is going to be that they're not equal.
01:24
Hi, in this question we're given some data on the amount that households in baltimore and houston pay for their, well their household bills, their utility...