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3 articles trouvés pour ce sujet.
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z-score |
2008-07-02 |
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Candace pose la question :
If a normal-shaped distribution has a mean of 80 and a standard deviation of 15 what is the z-score for M=84 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
Harley Weston lui répond. |
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The distribution of sample means |
2008-07-02 |
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crystal pose la question :
A population forms a normal distribution with a mean of 75 and a standard deviation of 20. How do I sketch the distribution of sample means for samples of n= 100?
Harley Weston lui répond. |
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Means of sample means |
2005-10-12 |
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Fareeha pose la question :
A population consists of six numbers 1,2,3,4,5,6
a) How many different samples of two numbers can be selected with replacement? and list them.
b) Calculate the mean and standard deviation of the population
b2) Calculate the mean and standard deviation of the mean of the samples.
c) Find the standard error of your estimated mean in question b2 and compare with the estimated standard deviation in b2.
Penny Nom lui répond. |
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