Applied Statistics

[xc0rax33]

The question is: A random sample of 53 students was asked for the number of semester hours they are taking this semester. The sample standard deviation was found to be s=4.7 semester hours. How many more students should be included in the sample to be 99% sure that the sample mean is within 1 semester hour of the population mean for all students at this college?

 

[Deleted member 4993]

The question is: A random sample of 53 students was asked for the number of semester hours they are taking this semester. The sample standard deviation was found to be s=4.7 semester hours. How many more students should be included in the sample to be 99% sure that the sample mean is within 1 semester hour of the population mean for all students at this college?

Start with looking at thae z-table - and finding the required value of z for the "probability" required.

Please share your work with us - indicating exactly where you are stuck - so that we may know where to begin to help you.

 

[xc0rax33]

Start with looking at thae z-table - and finding the requred value of z for the "probability" required.

do you mean look at the z-table for the required value of the 99% ? because I did and the value is 2.58.