The hypothesis test H 0 25H 1 25 is to be carried out A rand

The hypothesis test

H 0 :?=25H 1 :??25
is to be carried out. A random sample is selected, and yields x

The test statistic is

t=(xbar-mu)/(s/vn)

=(28-25)/(5/vn) =2.87749891398763

--> 3/(5/vn) =2.87749891398763

--> 3 = 2.87749891398763*5/vn

--> 3 = 14.38749/vn

--> vn = 14.38749/3 =4.79583

So n= 4.79583^2 = 22.99999

Take n=23