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The American Bar Association conducted a survey in 1986 showed that the average income of lawyers in 1986 was $ 120,000. An investigator took a sample of 64 lawyers in 1990, produced a median income of $ 140,000 with a standard deviation of $ 24.5000. Test the hypothesis at significance level of 5% if the median income of lawyers is more than $ 120,000. Show the steps of hypothesis testing and explain the conclusion.
Take a random sample and perform a t-test against a population mean (no time series for any parts of this project.) Test a hypothesis about a population mean.
Evaluate your histograms for any outliers in your data. Based on your evaluation of outliers, you may trim no more than 1% of the data contained in the data set. This must be done symmetrically (i.e., trimming no more than 0.5% off the top and 0.5..
Bicycle helmet use. Table lists data from a cross-sectional survey of bicycle safety. The explanatory variable is a measure of neighbourhood socioeconomic status (variable_RFM). The response variable is "percent of bicycle riders wearing a helmet"..
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
In an early study, researchers at an Ivy University found that 33% of the freshmen had received at least one A in their first semester.
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
Determine the average score for ERAU graduates? Determine the value of test statistic? Significance level?
Explain the difference between descriptive and prescriptive (optimization) models. Describe how to use Excel data tables, scenario manager, and goal seek tools to analyze decision models.
A) Describe the term population. B) Describe the term random sample. C) What is the difference between a population and a random sample?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Xerox Claims their copier is the same speed as Cannon's copier. The average speed of cannon's copier is 27 copies per minute. A test of 49 runs is done on the Xerox copier giving a sample mean X = 26 and a sample standard deviation s = 2.65.
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