Find the proportion of data values
In a normal distribution with u (mu)=90 and o (sigma)=15, find the proportion of data values between 80 and 110.
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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 what is the proportion of area between the z scores -2.09 and +.53
In a normal distribution find the probability expressed as a percentage that is greater than a z score of 2.33
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
You want to determine the average number of hours worked by professors at your university per week. You want to be able to express your answer as a confidence interval, with 95% confidence (that is, use z = 1.96) and you are aiming for a precision
An order for a computer can specify any one of three memory sizes, any one of two types of displays, and any one of four sizes of a hard disk, and can either include or not include a pen tablet. How many different systems can be ordered?
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