Consider the following data drawn independently from normally
distributed populations:
x1 = 34.4 | x2 = 26.4 |
σ_{1}^{2} = 89.5 | σ_{2}^{2} = 95.8 |
n_{1} = 21 | n_{2} = 23 |
a. Construct the 90% confidence interval for the
difference between the population means.
(Negative values should be indicated by a
minus sign. Round all intermediate calculations to at least 4
decimal places and final answers to 2 decimal
places.)
Confidence interval is__________ to__________.
b. Specify the competing hypotheses in order to
determine whether or not the population means differ.
H_{0}: μ_{1} − μ_{2} = 0; H_{A}: μ_{1} − μ_{2} ≠ 0
H_{0}: μ_{1} − μ_{2} ≥ 0; H_{A}: μ_{1} − μ_{2} < 0
H_{0}: μ_{1} − μ_{2} ≤ 0; H_{A}: μ_{1} − μ_{2} > 0
c. Using the confidence interval from part a, can
you reject the null hypothesis?
No, since the confidence interval includes the hypothesized value of 0.
Yes, since the confidence interval does not include the hypothesized value of 0.
Yes, since the confidence interval includes the hypothesized value of 0.
No, since the confidence interval does not include the hypothesized value of 0.
d. Interpret the results at αα = 0.10.
We cannot conclude that the population means differ.
We conclude that the population means differ.
We cannot conclude that population mean 2 is greater than population mean 1.
We conclude that population mean 2 is greater than population mean 1.
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