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Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 19. What is the minimum score needed to be in the top 5% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place.
Can you please include spreadsheet to input numbers and compute answer? Thanks
Develop a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of +/- 0.03 grams with 90% confidence?
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
For a normal distribution, the probability of randomly selecting a z-score greater than z = -2.00 is p = .0228.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
What is the p-value associated with the above sample result?
Quality Progress, February 2005, reports on improvements in customer satisfaction and loyalty made by Bank of America. A key measure of customer satisfaction is the response (on a scale from 1 to 10) to the question
According to a recent survey, the probability that a passengerfiles a complaint with the Department of Transportation about aparticular U.S. airline is .000014. Suppose 100,000 passengers whoflew with this particular airline are randomly contacted..
Find the value of W, the test statistic for a two sample rank-sum test that would compare the two methods for losing weight. Give the details of how you found W. Please show your step-by-step hand calculation here.
Determine out the regression equation. Determine the estimated sales if 40 contacts are made.
In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
would this prove that they are exceeding their goal, using α = .025?
Recognize and explain potential threats (up to 3) to external validity.
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