Statistical Inferences Answers
What range of values shows the confidence interval for the study?
A confidence level of 95% means:
Question text not available
What is the margin of error, assuming a 90% confidence level? Round your answer to the nearest tenth.
PENDING
You are told that in a sample of size 225 the mean is 48.5 and the standard deviation is 1.8. The study is reported with 90% confidence level. Explain how to determine if 48.8 is within the confidence interval.
To find the margin of error, multiply the z-score by the standard deviation, then divide by the square root of the sample size. The z*-score for a 90% confidence level is 1.645. The margin of error is 0.20. The confidence interval is 48.3 to 48.7. 48.8 is not within the confidence interval.
The margin of error for a 95% confidence level will be
Which of the following did you include in your explanation?
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