00:01
So an interesting problem about twins or teens, which the problem says refers to the age group of students in seventh grade, when they say that there's a growth spurt happening, very common.
00:20
Our sample is 12 randomly selected seven grade females from new york city, and we have the values, the 12 whole numbers, so their heights are rounded to the nearest whole number.
00:37
And the problem is asking us three parts.
00:41
So it tells us that we need to assume that the heights are normally distributed with a population standard deviation sigma of 2 .56 inches.
01:00
And we'll start with the parameter of interest.
01:03
So what do we need to estimate? we need to estimate the population mean, the mean height of seventh grade females.
01:30
For part b, we need to find a point estimate.
01:34
So we need to add those 12 values and divide by 12.
01:39
So the sum divided by 12.
01:44
So we have these values, we'll put them in a calculator and maybe calculate one -bar stats on all of them and we'll see the mean...