10 Answered Questions for the topic Confidence intervals

Confidence Intervals Statistics

07/18/21

How do you calculate MOE given Mean/Standard Deviation/Confidence Interval?

An example problem: You measure 40 turtles' weights, and find they have a mean weight of 51 ounces. Assume the population standard deviation is 13.4 ounces. Based on this, what is the maximal... more
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Confidence Intervals Statistics Economics Econometrics

06/06/21

How do you calculate the confidence intervals for a population mean with only the sample mean and sample standard deviation?
I have a random sample and need to calculate the 95% confidence interval for the population mean(sample mean = 1076sample standard deviation = 80.61sample size is n=5)
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Confidence Intervals Math Statistics

02/26/21

Confidence Intervals
Maximum breadth of samples of male Egyptian skulls from 4000 B.C. and 150 A.D. (based on data from Ancient Races of the Thebaid by Thomson and Randall-Maciver):4000 B.C. : 131 119 138 125 129 126... more
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02/20/21

How do I construct 95% confidence intervals for this question?
An article regarding interracial dating and marriage recently appeared in a newspaper. Of the 1704 randomly selected adults, 307 identified themselves as Latinos, 322 identified themselves as... more
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Confidence Intervals Statistics

10/22/20

How can I find a margin of error when the only information given is the 90% confidence interval numbers?
On my statistics homework, I have to find the margin of error given only the following: "The results of a recent World Health Organization (WHO) study stated that a 90% confidence interval on the... more
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Confidence Intervals Statistics

05/01/20

Looking for Margin of Error
Suppose you calculate a 99% confidence interval of 14.95 to 20.26. Determine the margin of error. Please explain the steps one would take in figuring this out. Thanks!
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Confidence Intervals Statistics Math Help Margin Of Error

12/19/18

You are a researcher studying the lifespan of a certain species of bacteria. (Thanks for the help!)
A preliminary sample of 30 bacteria reveals a sample mean of ¯ x = 70 hours with a standard deviation of s = 4.6 hours. You would like to estimate the mean lifespan for this species of... more
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Confidence Intervals Math Statistics Math Help

12/19/18

In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length of a motor vehicle trip in the United States was 9.72 miles with a margin or error of 0.22 miles.
With 95% confidence the authors of the report are claiming that the true average length of a motor vehicle trip in the United States is between _________ and _________ milesThe level of confidence... more
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Confidence Intervals Statistics Math Help

12/19/18

You measure 29 backpacks' weights, and find they have a mean weight of 43 ounces. Assume the population standard deviation is 4 ounces.
Based on this, what is the maximal margin of error associated with a 99% confidence interval for the true population mean backpack weight.± ____________ ounces
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Confidence Intervals Statistics

10/14/14

1900 registered voters in Flagstaff found 209 voters. 95% confidence interval for the true percent of registered voters
A random sample of 1900 registered voters in Flagstaff found 209 registered voters who vote as an independent. Find a 95% confidence interval for the true percent of registered voters in Flagstaff... more
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