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Manufacturing and Product Development
According to U.S. Inspect, roofing shingles weighed approximately 240 pounds per square foot prior to 1973, and modern shingles weigh approximately 190 pounds per square foot, depending on the material and the manufacturer. Suppose a brand of recycled synthetic shingles is advertised to weigh 185 pounds per square foot. A random sample of these shingles was obtained, and the weight of each is given in the following table.
Assume σ = 2.7. Is there any evidence to suggest that the true mean weight of these recycled shingles is different from 185 pounds per square foot? Use a = 0.05 and compute the p value to draw a conclusion.
The monthly sales demand for a new product is uncertain, but it is considered to be adequately described by a normal random variable with mean 50,000 units and variance 100,000,000.
2 cards drawn from a 52 but before the second card is drawn you put the first one back and reshuffle the deck. Are the outcomes on the two cards independent and why?
A recent article in the Myrtle Beach Sun Times reported that the mean labor cost to repair a colour television is $90 with a standard deviation of $22. Monte's TV Sales and Service completed repairs on two sets this morning. The labor cost for the..
Students in the industrial statistics lab at ASU calculate a lot of confidence intervals on mu. Suppose all these CIs are independent of each other.
Ssample by constructing a histogram and finding the sample mean and standard deviation, are we investigating the sampling distribution of the mean? why or why not?
Direct versus Indirect Exchange Rates Assume that during this semester, the euro appreciated against the dollar. Did the direct exchange rate of the euro increase or decrease? Did the indirect exchange rate of the euro increase or decrease?
a researcher wanted to investigate whether there was a difference in satisfaction ratings in an assisted living
where p is the binomial probability of returning a completed survey, and log is the natural logarithm. The multiple logistic regression output from fitting this model is given below.
Let X be the number of individuals in a simple random sample of size 50 from this population who get some relief by taking ibuprofen, and let pˆ be the sample proportion. Find the probability that the value of p is in the interval
Findout probabilities utilizing standard normal distribution. If the debt is normally distributed with a standard deviation.
Discuss the assumptions for using a chi-square test. Research articles using and provide practical examples from the reseach to support your assumptions.
Below is the number of new cars sold at Sharkey in the last seven months and for the last eight months at Dave White. Do you agree with Mr. Sharkey? Use the .01 significance level."
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