Proportion of area between the z scores
In a normal distribution what is the proportion of area between the z scores -2.09 and +.53
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Calculate a 90% confidence interval for the true average hole diameters, and give the interpretation.
In one particular investigation, a sample of 48 shear strength observations gave a sample mean strength of 17.17 N/mm2 and a sample standard deviation of 3.28 N/mm2. Find a lower confidence bound for true average shear strength µ with confid
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that between 175 and 200 homes are going to be
In a normal distribution find the probability expressed as a percentage that is greater than a z score of 2.33
In a normal distribution with u (mu)=90 and o (sigma)=15, find the proportion of data values between 80 and 110.
Compare the difference in the widths of the two confidence intervals for their means.
The US department of transportation maintains statistics for consumer complaints for 100,000 airline passengers. In the first nine months of 2009 consumer complaints were 0.99 per 100,000 passengers. What is the probability that in the next 100,00
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