Standard Error of the Mean and Standard Error of the Difference
Please give a full explanation of the difference between a standard error of the mean and a standard error of the difference between means.
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The standard error of the mean is the margin or error by which the mean (average) of a number of samples taken from the same population. This error may cause the mean to be slightly off ...
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Please give a full explanation of the difference between a standard error of the mean and a standard error of the difference between means.
Thestandarderror of themean:
A. is never larger than thestandard deviation of the population
B. decreases as the sample size increases
C. measures the varability of themean from sample to sample
D. All of the above
Question: Suppose N = 80000, n = 16000 and s = 50.
a. Compute thestandarderror of the sample mean using the finite population correction factor.
b. Repeat part a assuming n= 32000.
c. Repeat part a assuming n = 80000.
d. Compare parts a, b and c, and describe what happens to thestandarderror of the sample mean as n i
A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standarderror of 25? Sample sizes are whole numbers.
This is based on the formula for thestandarderror of themean.
A. Determine thestandarderror of estimate.
B. Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding sales would occur between what two values?
Exercise 14:
Number of Sales Number of Sales
Contacts, ($ thousands),
Two separate samples, each with n=15 individuals, receive different treatments. After treatment, the first sample has SS=1740 andthe second has SS=1620.
The pooled variances for the two samples is _________.
Compute the estimated standarderror for the sample meandifference.
Estimated s(M1-M2)=________
If the sample mean
What is the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
a. Normally distributed (discuss).
b. Non-normally distributed. (discuss)
2. What is thedifference, if any, between thestandard deviation of the sample andthestandarderror of themean
Why is it important to know thestandard deviation for a given sample? What do researchers learn about a normal distribution from knowledge of thestandard deviation? A sample of n=20 has a mean of M = 40. If thestandard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
Can you please d
