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Based on our past history of winning bids on projects, the probability of winning the next contract to build a school is 0.40, to build a hospital 0.30 and to build both a school and a hospital is 0.20. What is the probability winning a contract to build either the school or the hospital? The school only? The hospital only?
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
In some ways, ANOVA is like what communications engineers refer to as "signal-to-noise ratio". What could I possibly mean by that statement?
How much error, on average, would you expect between the sample mean (M) and the population mean for: a sample of n=4 scores, a sample of n=16 scores, and a sample of n=25 scores.
Each party's position must be statistically sound. Include as suitable graphs, computations, and statistical tests.
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At = .05, is a difference in the two amounts?
Explain in your own words why the test statistic for Goodness-of-Fit is similar to the calculation for Population Standard Deviation.
You're the production manager for operation that produces circuit boards. Each board is tested at the end of manufacturing process. Rejected boards are discarded and have no future value.
The intensity and frequency of hurricanes increases by 2% over the historical projections and claims increase proportionately. Evaluate data using the appropriate test for significance. Rationale for using the test is clear.
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
Compute z values for each and comment on your findings.
A sociologist interested in cultural differences compared women of two ethinic groups on a Role Approval Index. If you conduct a t test for independent means, how many degrees of freedom are in the t distribution?
Get a test statistic and p -value. Interpret results at α = .01.
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