Aside: Notice that it is the same basic formula as all our other confidence intervals:
CI = our estimated mean ± a critical value * a standard deviation
And, by the way, remember that we call the standard deviation by the name “standard error” when we had to estimate it from the data.
Level of Significance , α = 0.1
Degree of freedom, DF= n1+n2-2 = 35
t-critical value = t α/2 =
1.690 (excel formula =t.inv(α/2,df)
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Both samples >=30, so normal approximation holds
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THANKS
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Suppose that I want to construct a confidence interval for a two-sample problem with degrees of...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
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Can I get help in how to work on c with Minitab. Just steps
would help a lot. thank you
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A through D please
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