SOLUTION: I have a multiple choice question that I've been working on with Megastat but I don't seem to be using megastat correctly. Suppose a one-tailed t-test is being applied to find

Question 451231: I have a multiple choice question that I've been working on with Megastat but I don't seem to be using megastat correctly.
Suppose a one-tailed t-test is being applied to find out if the population mean is less than $212. The level of significance selected is 0.01 and 26 accounts are sampled. What is the critical value?
A. �2.580
B. �2.485
C. �1.960
D. �2.479
E. None of the above
Any help will be greatly appreciated!
Found 2 solutions by stanbon, ewatrrr:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Suppose a one-tailed t-test is being applied to find out if the population mean is less than $212. The level of significance selected is 0.01 and 26 accounts are sampled. What is the critical value?
------
invT(0.01,25) = -2.485
----------------------------
Cheers,
Stan H.
================
A. �2.580
B. �2.485
C. �1.960
D. �2.479
E. None of the above

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi
a one-tailed t-test is being applied to find out if the population mean is less than $212
level of significance selected is 0.01 and 26 accounts are sampled. df = 25
critical value is -2.485
98% one-tailed is equivalent to a two-tailed test at the 99% confidence level...
2-tailed chart
df 90 95 97.5 98 99
10 1.372 1.812 2.228 2.764 3.169
11 1.363 1.796 2.201 2.718 3.106
12 1.356 1.782 2.179 2.681 3.055
13 1.35 1.771 2.16 2.65 3.012
14 1.345 1.761 2.145 2.624 2.977
15 1.341 1.753 2.131 2.602 2.947
16 1.337 1.746 2.12 2.583 2.921
17 1.333 1.74 2.11 2.567 2.989
18 1.33 1.734 2.101 2.552 2.878
19 1.328 1.729 2.093 2.539 2.861
20 1.325 1.725 2.086 2.528 2.845
21 1.323 1.721 2.08 2.518 2.831
22 1.321 1.717 2.074 2.508 2.819
23 1.319 1.714 2.069 2.5 2.807
24 1.318 1.711 2.064 2.492 2.797
25 1.316 1.708 2.06 2.787
26 1.315 1.706 2.056 2.479 2.779
27 1.314 1.703 2.052 2.473 2.771
28 1.313 1.701 2.048 2.467 2.763
29 1.311 1.699 2.045 2.462 2.756
30 1.31 1.697 2.042 2.457 2.75

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