Chapter 6, Section 4-D, Exercise 186 xIncorrect Use a -distribution to answer th

Question

Chapter 6, Section 4-D, Exercise 186 xIncorrect Use a -distribution to answer this question. Assume the samples are random samples from distributions that are reasonably normallydiributed, and that a -statistic will be used for inference about the difference in sample means. State the degrees of freedom used. Find the proportion in a -distribution less than-1.4 if the samples have sizes -30 and n 40. Enter the exact answer for the degrees of freedom and round your answer for the area to three decimal places. degrees of freedom0083 68 proportion =

Explanation / Answer

Degrees of freedom = n1 + n2 - 2 = 30 + 40 - 2 = 68

Hence,

Proportion = P(t68 < -1.4) = 0.083

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