Chapter 6, Section 4-D, Exercise 186 Use a t-distribution to answer this questio

Question

Chapter 6, Section 4-D, Exercise 186 Use a t-distribution to answer this question. Assume the samples are random samples from distributions that are reasonably normally distributed, and that a t-statistic will be used for inference about the difference in sample means. State the degrees of freedom used Find the proportion in a i-distribution less than -1.4 if the samples have sizes n30 and 240 Enter the exact answer for the degrees of freedom and round your answer for the area to three decimal places. degrees of freedom = proportion

Explanation / Answer

here as it is nt given that popuklation variance are equal

theref are two possibilities:

degree of freedom =n1+n2-2=30+40-2=68 ( please try 29 if this not work if conservative method is used)

proprotion =0.083 (please try 0.086 if this not work if conservative method is used)

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