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kaheart [24]
2 years ago
8

Use a t-distribution to answer this question. Assume the samples are random samples from distributions that are reasonably norma

lly 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 t-distribution less than −1.4 if the samples have sizes n1=30 and n2=40.

Enter the exact answer for the degrees of freedom and round your answer for the area to three decimal places.
Mathematics
1 answer:
Dimas [21]2 years ago
8 0

Using the t-distribution, it is found that the proportion in a t-distribution less than −1.4 if the samples have sizes n1=30 and n2=40 is of 0.083.

<h3>How to find a proportion in a t-distribution?</h3>

The proportion is found using a calculator, with three inputs:

  • The tail of the test, if it is left, right, or two-tailed.
  • The test statistic.
  • The amount of degrees of freedom.

In this problem, we have a left-tailed proportion, as we want the proportion that is less than a value, with test statistic t = -1.4 and 30 + 40 - 2 = 68 df, hence the proportion is of 0.083.

More can be learned about the t-distribution at brainly.com/question/16162795

#SPJ1

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