For a one-tailed test (lower tail), a sample size of 10 at 90% confidence, t = A

ID: 3229286 • Letter: F

Question

For a one-tailed test (lower tail), a sample size of 10 at 90% confidence, t =

A) 1.383

B) 1.372

C) - 1.383

I know the answer is C, but can someone explain why? NOT using excel!!!!

Formulas Standard Deviation of Finite Population Infinite Population Test for finite population correction factor N s 05 Finite population correction factor interval estimate of a population mean with standard deviation known X t za/2 Interval estimate of a population mean with standard deviation unknown R t ta/2 in with n-1 degrees of freedom Test statistic for hypothesis tests about a population mean with standard deviation known Ho Test statistic for hypothesis tests about a population mean with standard deviation unknow Ho

Explanation / Answer

first of all as from the question as it has been given that it is lower tail test; mean the test stat critical value will fall on the left end mean its value should be negative. also from ti-83 we can get the value of above by:

-invT(0.1,0,9)

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For a one-tailed test (lower tail), a sample size of 10 at 90% confidence, t = A

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Explanation / Answer

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