MATH 221 Week 6 Discussion; Confidence Interval Concepts

# MATH 221 Week 6 Discussion; Confidence Interval Concepts

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MATH 221 Week 6 Discussion; Confidence Interval Concepts Confidence Interval Concepts (graded) Consider the formula used for any confidence interval and the elements included in that formula. What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sample size, or (c) increase the margin of error? Only consider one of these changes at a time. Explain your answer with words and by referencing the formula.

Confidence interval for population mean is

Sample mean /- Margin of error (ME)

Margin of error critical value of z or t * standard deviation / sqrt sample size Critical value depends on the degree of confidence. It can be 90% or 95% or 99% or any percentage. The test criterion depends on the sample size. If sample size...

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