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Sheila Johnson, a state procurement manager, is responsible for monitoring the integrity of a wide range of products purchased by state agencies. She is currently exam- ining a sample of paint containers recently received from a long-time supplier. According to the supplier, the process by which the cans are filled involves a small amount of variation from one can to the next, and the standard devia- tion is 0.25 fluid ounces. The 40 cans in Sheila's sample were examined to determine how much paint they con- tained, and the results (in fluid ounces) are listed in data file XR09023. Using the mean for this sample, and assuming that the population standard deviation is 0.25 fluid ounces, construct the 90% confidence interval for the population mean volume for the cans of paint provided by the supplier. If the labels on the paint cans say the mean content for such containers is 100.0 fluid ounces, would your confidence interval tend to support this possibility?
Find the standard error of mean. Also establish an interval estimate around the sample mean using one standard deviation of the mean.
The sampled results show that sample mean and standard deviation were $52.00 and $17.50, respectively. Use this information to create a 95% confidence interval for the mean.
I survey 50 potential consumers regarding their interest in the product, 34 express an interest in purchasing it. The maximum price each would be willing to pay is shown below.
Can one conclude at the 0.05 significance level that the morning class performed worse than the afternoon class? Work the problem first by hand, supplying all the details for the Mann-Whitney U test.
Assume there are 18 homes in the Quail Creek area and 8 of them have a security system. Five homes are selected at random: What is the probability all five of the selected homes have a security system?
Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet.
the probability that an individual has 20-20 vision is 0.15. in a class of 50 students what is the mean and standard
judy is going to silver dipper ice cream shop to get a treat. she has 12 flavors of ice cream to choose from. there are
Find the expected number of boys in royal family and the expected num- ber of girls - Show that, if X and Y are random variables taking on only two values each.
consider a stock with s0 50 that pays a dividend of 1 at t 1. suppose the effective not continuous annual interest
A student heard that the average household watches 26.4 hours of t.v. per week, with a stand.dev. of 2.3 hours. He decided to run his own experiment and found that the average for the 58 people he surveyed was 27 hours. a) state H0 and H1 b) calculat..
an article in the journal of composite materials vol 23 1989 p. 1200 describes the effect of delamination on the
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