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No. & Date Asked  Question 

# 670 :: 4/13/09

Assume that z is the test statistic and calculate the value of z∗ for testing the null hypothesis Ho: μ =150.0 when σ = 4.5, n=15, x(b. . .
test statistic,
ztest 
# 555 :: 12/14/08

Complete the following:
a. Select a variable. Compare the mean of the variable for a sample of 30 for one group with the mean of the variable for a . . .
2sample ttest,
2proportion test,
2sample ztest,
ztest 
# 344 :: 8/14/08

Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using . . .
Standard Deviation,
ztest,
Normally Distributed,
Homogeneity of Variance 
# 330 :: 8/9/08

If you had a sample size of 50 and did not know the standard deviation of the population, would you use a t or a z statistics in your analysis? Why?. . .
ttest,
ztest 