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INSTRUCTIONS: Caution: 9.01 is tricky because of quirks in the Excel function. Check your answer for reasonableness by comparing it with the answer for the standard normal distribution and with a large value for degrees of freedom.
FACTS: N/A
PROBLEM:
Compute the following probabilities using excel:
(a) P (t10 ≥ 1.75) where t10 has a t distribution with 10 degrees of freedom. (b) P (t100 ≥ 1.75) where t100 has a t distribution with 100 degrees of freedom. How do you explain the difference between this result and the one obtained in part (a)? (c) P (Z ≥ 1.75) where Z is a standard normal distribution with 10 degrees of freedom. Compare this result to the results obtained in parts (a) and (b). How do you explain the difference in these probabilities? (d) P (t20 ≤ -0.80) where t20 has a t distribution with 20 degrees of freedom. (e) P (t3 ≤ -0.80) where t3 has a t distribution with 3 degrees of freedom. How do you explain the difference between this result and the one obtained in part (d)?
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