Thursday

July 31, 2014

July 31, 2014

Posted by **helga** on Sunday, February 1, 2009 at 9:37pm.

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?

a. 0.2

b. 4.47

c. 5

d. 100

e. can't determine without sample mean

what is the critical z-value for an 85% confidence interval?

a. .8023

b. 1.44

c. 1.04

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

- statistics -
**gen**, Tuesday, February 3, 2009 at 9:10amhi, u can solve it by this formula

S=√Σ(X-mean)

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n-1

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