need help with statistics homework

Statistics
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Power+,Inc. produces AA batteries used in remote controlled toy cars. The mean life of these batteries follows the normal probability distribution with a mean of 37 hours and a standard deviation of 5.5 hours. As part of its quality assurance program,  Power+, Inc. tests samples of 9 batteries 

a) What can you say about the shape of the distribution of the sample mean?

Binomial 

Uniform 

Normal

b) what is the standard error of the distribution of the sample mean? (Round your answer to 4 decimal place

Apr 4th, 2015

(a) What can you say about the shape of the distribution of the sample mean?

Answer: Normal

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(b) What is the standard error of the distribution of the sample mean? (Round your answer to 4 decimal places.)

standard deviation =s/vn

=5.9/sqrt(9)

=1.9667


Apr 4th, 2015

A population consists of the following five values 2,3,5,5, and 7. 

a) List all samples of size 2 from left to right using without replacement,  and compute the mean of each sample  (Round your mean values to 1 decimal place. )

Sample.         Values.          Sum.             Mean 

1

2

3

4

5

6

7

8

9

10

b) Compute the mean of the distribution of sample means and the population mean  (Round your answers to 1 decimal place.)

Mean of the distribution of the sample mean 

Population 

Apr 4th, 2015

hey i know answer but please can you upload other question.. please.. not reply here.. please upload as different question

Apr 4th, 2015

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