John Wants to Compare Two Means

question 7

Multiple Choice

John wants to compare two means.His sample statistics were 1 = 22.7,s12 = 5.4,n1 = 9 and 2 = 20.5,s22 = 3.6,n2 = 9.Assuming equal variances,which is the approximate 95 percent confidence interval for the difference of the population means?

• A)[2.44,6.19]
• B)[1.17,5.08]
• C)[0.08,4.32]
• D)[−0.09,3.19]

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