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Plot the data on U.S. general aviation shipments (b) Describe the patterns and discuss possible causes.(c) Would a fitted trend be helpful? Explain. (d) Make a similar graph for 1992-2003 only. Would a fitted trend be helpful in making a prediction for 2004? (e) Fit a trend model of your choice to the 1992-2--3 data (f) make a forecast for 2004, using either the fitted trend model or a judgement forecast. Why is it best to ignore earlier years in this data set?
Critically discuss the lower control limit for a proportion defective if the average daily production is 5000 units and the average fraction defective is .02?
He would like to estimate with .05 of the true proportion with a confidence level of 90%. What is the sample size needed?
The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
What can you tell me about the direction, strength and significance of this association and What would you expect for somebody without any formal education whatsoever and what can you tell me about the nature of this relationship?
Listed below are weights in grams from a sample of these bats. Construct a 95% confidence interval estimate of their mean weight.
Many newspapers carry a certain puzzle in which the individual must unscramble letters to form words. How many ways can the letters of YARNLE be arranged?
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Are there differences in satisfaction with Intake process of clients who admit with mental health problems, substance abuse problems, or both.
To find z-score and required probabilities based on Normal distribution. Assume that childrens weekly allowances are normally distributed in the population.
No estimate of the population proportion is available. How large a sample is required?
The upper limit of a 95% confidence interval for the population mean would equal:
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