Applied Statistics

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xc0rax33

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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?
 
xc0rax33 said:
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?
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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.
 
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.
 
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