posted by helga .
what are the mean and standard deviation of a sampling distribution consisting of samples of size 16? these sameples were drawn from a population whose mean is 25 and who standard deviation is 5.
a. 25 and 1.25
b. 5 and 5
c. 25 and 5
d. 5 and 1.25
e. 25 and square root of 5
the standard deviations of SAT scores is 100 points. a researcher decides to take a sample of 500 students' scores to estimate the mean score of students in your state. what is the standard deviation of the sample mean?
e. can't determine without sample mean
what is the critical z-value for an 85% confidence interval?
d. need population standard deviation
e. need sample size
which of the follow isn't necessary to compute the sample size appropriate for a given confidence level and margin of error?
a. sample mean
b. populatuion standard deviation or an estimate of standard deviation
c. critcal z-value, z*
d. the margin of error m.
e. all of these values are neccessary
hi, u can solve it by this formula