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Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products, however, Chuch has been forced to increase the price of the Ultra-Lite pencils. As a result, the demand for Ultra-lite has been fairly stable over the past 6 years. On the average, Armstrong Faber has sold 457,000 pencils each year. Furthermore, 90% of the time sales have been between 454,000 and 460,000 pencils. It is expected that the sales follow a normal distribution with a mean of 457,000 pencils. Estimate the standard deviation of this distribution. (Hint: work backward from the normal table to find Z then apply the proper equation.
Data is given in the table below. Process data as illustrate in the paper on the Mann-Whitney U test. Critical Value:Test Statistic (Show procedure.)Z .
Construct a 95% confidence interval for the proportion of people disagreeing with the statement.
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
Find the value for the correlation coefficient r.
Determine the probability, P(Z
Suppose that the two lists are combined to produce a new list of 18 values. What is the average (mean) of this new list?
Find the margin of error for the estimator in this survey for a 95% level of confidence . In part c, what does the 95% level of confidence imply in relation to the margin of error?
a. State the appropriate hypotheses for your significance test. b. Use the sample results to compute the test statistic and the p-value.
What is the probability of a fatal accident over a lifetime?
What was the probability that a student worked a part time job or made the Dean's list. Interpret the results.
Show the decision rule graphically. Use the .05 significance level.
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