Confidence interval for the mean life of that brand
For a sample of 20 tires of a particular brand, the average tread life was 65,000 miles with a standard deviation of 8,000. Find the 99% confidence interval for the mean life of that brand. (small sample)
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Find the number of chocolate chips a cookie should contain on the average if it is desired that the probability of a cookie containing at least one chocolate chip be .99.
A company is criticized because only 19 of 49 executives at a local branch are women. the company explains that although this proportion is lower than it might wish, it's not a surprising value given that only 41% of all its employees are women. T
In October 2000, the U.S. Department of Commerce reported the results of a large scale survey on high school graduation. Researchers contacted more than 25,000 Americans aged 24 years to see if they had finished high school: 84.9% of the 12,460 ma
In a sample of 1000 people, 540 are in favor of candidate A and the rest are in favor of candidate B. Find the 95% confidence interval for the percentage in favor of candidate A:
A manufacturer of computers claims its batteries last an average of 3.5 hours before needing recharging. For a sample of 10 batteries, the mean life was 3 hours and the standard deviation was 0.8. Can we conclude at the 0.01 level that the mean li
The number of planes arriving per day at small private airport is a random variable having a poisson distribution with lambda=28.8. What is the probability that the time between 5 consecutive arrivals is at most 1 hour?
Based on the results, construct a 95% confidence interval estimate of the percentage of all such pages that have advertising (41%). Show all steps for creating your interval.
Construct a summary table and a horizontal bar graph to describe the ice types of the 504 melt ponds. Find a 90% confidence interval for the true mean visible albedo value of all Canadian Arctic ice ponds in column L to T.
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