random sample of  n1 = 49  measurements from a population with population standard deviation  ?1 = 3  had a sample mean of  x1 = 9.  An independent random sample of  n2 = 64  measurements from a second population with population standard deviation  ?2 = 4  had a sample mean of  x2 = 11.  Test the claim that the population means are different. Use level of significance 0.01.

MATLAB: An Introduction with Applications
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A random sample of 

n1 = 49

 measurements from a population with population standard deviation 

?1 = 3

 had a sample mean of 

x1 = 9.

 An independent random sample of 

n2 = 64

 measurements from a second population with population standard deviation 

?2 = 4

 had a sample mean of 

x2 = 11.

 Test the claim that the population means are different. Use level of significance 0.01.

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