00:01
Here, for the given question, we have the sample obtained from normal distribution, n is equal to, our sample size is given here, 21, and here our population standard deviation is given, that is our value of sigma is given here, 1 .1, and our value of standard deviation is given here, 1 .9.
00:33
Now, we'll set our null hypothesis, we'll set our null hypothesis at h0 is to sigma is equal to 1 .1, and our alternative hypothesis will set it h1 is to sigma is not equal to 1 .1.
00:51
Now, our given sample standard deviation, s is equal to here, given 1 .9, so our test statistics, t is equal to will be your s square into n minus 1 by sigma square.
01:06
This is approximately equal to here, our c square test, x square into n minus 1, which is our degree of freedom...