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DanielleElmas [232]
2 years ago
12

Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate: (a) find the critical value t

α/2​, ​(b) find the critical value zα/2​, or​ (c) state that neither the normal distribution nor the t distribution applies.
The confidence level is 99​%, σ is not​ known, and the histogram of 56 player salaries​ (in thousands of​ dollars) of football players on a team is as shown.
Mathematics
1 answer:
Feliz [49]2 years ago
4 0

Considering that we have the standard deviation for the sample, the t-distribution will be used, and the critical value is t = 2.6682.

<h3>When should the t-distribution and the z-distribution be used?</h3>
  • If we have the standard deviation for the sample, the t-distribution should be used.
  • If we have the standard deviation for the population, the z-distribution should be used.

In this problem, σ is not​ known, hence we get the standard deviation of the sample from the histogram and the t-distribution is used.

Using a t-distribution calculator, considering a <em>confidence level of 99​%</em> and 56 - 1 = <em>55 df</em>, the critical value is t = 2.6682.

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

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w= width
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SOLVE FOR WIDTH
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