00:01
Hello student, it is given that a medical researcher is trying to determine whether a population variances of systolic blood pressure levels are same for patients who take a new medication for high blood pressures and patients who do not take medication.
00:20
So, here control group consists of 31 patients who has variance which is equal to 165 .120.
00:31
Now, treatment group consists of 28 patients.
00:38
So, here n2 is equals to 28 and here s2 square which is equal to 85 .010.
00:48
Now, here we have to construct a 90 percent confidence interval for ratio of population variances of systolic blood pressure.
00:59
Now, here alpha is equal to 1 minus confidence level.
01:03
So, here 1 minus 0 .90 which is equals to 0 .1.
01:08
Now, here formula for constructing confidence interval for ratio of variances.
01:14
So, here f alpha by 2 n2 minus 1 comma n1 minus 1 into s1 square divided by s2 square f of 1 minus alpha by 2 n2 minus 1 comma n1 minus 1.
01:41
So, here s1 square divided by s2 square.
01:46
Now, here we substitute the value of alpha...