statistic
posted by Sharon .
. For each of the following, assume that the two samples are selected from populations with equal means and calculate how much difference should be expected, on average, between the two sample means.
a. Each sample has n _ 5 scores with s2 _ 38 for the first sample and s2 _ 42 for the second. (Note: Because the two samples are the same size, the pooled variance is equal to the average of the two sample variances.)
b. Each sample has n _ 20 scores with s2 _ 38 for the first sample and s2 _ 42 for the second.
c. In part b, the two samples are bigger than in part a, but the variances are unchanged. How does sample size affect the size of the standard error for the sample mean difference?

+33
Respond to this Question
Similar Questions

statistics
1)Please Help In testing whether the means of two normal populations are equal, summary statistics computed for two independent samples are as follows: Assume that the population variances are equal. Then, the Pooled Variance is equal … 
statistics ***pls help!
for each of the following, assume the 2 samples are selected from populations with equal means and calculate how much difference should be expected, on average, between the 2 sample means. a)each sample has n = 5 scores with s^2 = … 
bus stats
Given the following information about a hypothesis test of the difference between two means based on independent random samples, what is the standard deviation of the difference between the two means? 
phoenix
Each sample has n= 5 scores with s2 =38 for the first sample and s2 = 42 for the second. (Note: Because the two samples are the same size, the pooled variance is equal to the average of the two sample variances.)calculate how much … 
math check
Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct … 
math
Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct … 
Statistics
Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct … 
Statistics
Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct … 
statistics
Select the TWO options that are TRUE statements about twosample ttests. Select one or more: The same formula is used for the ESE (estimated standard error) in the twosample ttest with a common variance and the twosample ttest … 
statistics
Select the TWO options that are TRUE statements about twosample ttests. Select one or more: The same formula is used for the ESE (estimated standard error) in the twosample ttest with a common variance and the twosample ttest …