Question

** WILL FAN & MEDAL **
The mean score on a biology exam taken by all undergraduate students in a college in a particular year is 67.8 with a standard deviation of 11.5.
The standard error of the mean for a sample of 70 students is *blank*
, and the margin of error of the mean is *blank*
What are the blanks?. (Round off your answers to the nearest hundredth.)

Answer 1

Well Standard error of the mean = Standard deviation/sqrt n
= 11.5/sqrt 70
= 1.3745

Margin of error = Confidence coefficient*Standard error of mean
= 1.96*11.5/sqrt 70
= 2.694
so..Confidence coefficient is the critical value of z for 95% confidence level = 1.96
If the level of confidence is NOT indicated 95% level can be considered

Answer 2

Thanks a lot I just don't know all of the formulas for these I'm trying to remember.