Using the Minitab command Graph>Probability Distribution Plot (see hints on Piaz

Question

Using the Minitab command Graph>Probability Distribution Plot (see hints on Piazza) for this problem. The point here is to practice using Minitab for calculating critical values:

1. Calculate a critical value for a t distribution. Calculate the value, t, such that P(-t < X < t) = 0.95, where X has a t-distribution with 16 degrees of freedom (Blank #1, two decimal places).

2. Calculate a critical value for a t-distribution. Calculate the value, t, such that P(-t < X < t) = 0.87, where X has a t-distribution with 34 degrees of freedom (Blank #2, three decimal places).

3. Calculate a critical value for a chi-squared distribution. Calculate the value, z, such that P(X>z) = 0.90, where X has a chi-squared distribution with 34 degrees of freedom (Blank #3, two decimal places).

Explanation / Answer

1. Required t - value = 2.12

2. Required t value = 1.55

3. Required chi square value = 23.95

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