The following is a tumor size for two different type of breast cancer. Type of tumor n -;{ x}


Question: The following is a tumor size for two different type of breast cancer.

Type of tumor n \[\overset{-}{\mathop x}\,\] s
I 20 3.5 1.80
II 15 2.7 1.50

a) Construct a 95 percent confidence interval for each type of tumor

b) Construct a 99 percent confidence interval for the difference between populations mean.

c) Can we conclude the mean of tumor size is different for two groups? Let alpha=0.05.

d) Interpret the results

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