Question

Random samples of size 78 were selected from a population with mean 137 and standard deviation...

Random samples of size 78 were selected from a population with mean 137 and standard deviation 4.2.

A.) What is the mean of the sample means (  x )?

B.) What is the standard deviation of the sample means (  x )?

Math   Statistics-And-Probability   
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Answer #1

Solution :

Given that,

mean = = 137

standard deviation = = 4.2

n = 78

A.)

= 137

B.)

= / n = 4.2 / 78 = 0.4756  

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