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A jar contains 4 purple and 10 black marbles. A marble is drawn at random. What is the fraction in the simplest form?
Find the probability that the second cube selected is black. Given that the first cube selected is red, what is the probability that the second cube selected is black?
What kind of distribution do we have here? What is the expected number of fatalities? What is the standard deviation of the number Y of fatalities?
What are the advantages and disadvantages of one-tailed and two-tailed tests?
Urn A contains 9 cubes of which 4 are red. Urn B contains 5 cubes of which 2 are red. A cube is drawn at random and in succession from each urn. Draw a tree diagram representing this process.
If the sample mean were M = 56, what value would be obtained for Cohen's d? How does the size of the mean difference influence the measure of effect size?
A sample of n = 16 individuals is selected from a normal population with a mean of µ = 48 and a standard deviation of s = 12. After receiving a treatment, the sample mean is found to be M = 52
A copy machine dealer has data on the number x of copy machines at each of 89 customer locations and the number y of service calls in a month at each location. Summary calculations give x? = 804, s
A researcher wishes to estimate, with 95% confidence, the proportion of people who own a home computer. A previous study shows that 40% of those interviewed had a computer at home. The researcher wi
In a survey of 891 US adults who follow baseball in a recent year, 184 said that the Boston Red Sox would win the World Series. Construct a 90% confidence interval for the population proportion of U
In a recent survey of 1003 US adults, 110 say they would go on vacation to Europe if cost did not matter. Find p and q, where p is the proportion of US adults that say they would go on vacation.
A random sample of 55 standard hotel rooms in the Philadelphia, PA area has a mean nightly cost of $154.17 and a standard deviation of $38.60. Construct a 99% confidence interval for the population
Based on your study of z-scores, explain the three uses of z-scores. How might they each relate to Eric's trip between home and work? What is the relationship between z-scores and the standard norma
A new radar device is being considered for a certain defense missile system. The system is checked by experimenting with actual aircraft in which a kill or a no kill is simulated.
Explain the purpose of Chi-square & when to apply it. How is chi-square similar to other significance tests? What makes it unique? When should it be used? What requirements must be met to use ch
How would you know if the regression results were a good predictor of the dependent variable? What decisions could be made or insights provided through the regression results?
The management of a regional bus line thought the company's cost of gas might be correlated with its passenger/mile ratio. The data and a correlation matrix follows. Comment.
Calculate the result and error (Where Relevant) for the following quantities: Volume of a box with height 7.874 cm +/- 1.524, Width 23.368 cm +/- 2.286 cm, and depth 25.3 cm +/- 3.9 cm.
Conduct a Z-test to determine whether the following two samples indicate that the population proportions are significantly different at the 0.05 level:
If you were given a large data set such as the sales over the last year of our top 1,000 customers, what might you be able to do with this data? What might be the benefits of describing the data?
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families, some with only a single in
Below, is a pay-off table for four projects P1, P2, P3, and P4; with different possible outcomes in four different states of the world S1, S2, S3, and S4. The value in parenthesis and next to each