Question 7 1 pts When the sample size is fixed, increasing the confidence level

Question

Question 7 1 pts When the sample size is fixed, increasing the confidence level O improves precision of the confidence interval estimate O decreases precision of the confidence interval estimate O increases the standard error of the point estimate O decreases the chance that the confidence interval contains the true mean Question 8 1 pts Which of the following confidence levels results in a confidence interval with the shortest length? 99% confidence O 95% confidence O 90% confidence 80% confidence

Explanation / Answer

7)

As the confidence interval increases the precision of interval estimate increases

As we can be more confident to say that the mean in this interval

8) The length of 80 is shortest

Because as the confidence interval increases the length of the confidence interval increases

It is more for 99%confidence interval

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