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1. A researcher is interested in studying the relationship between certain driving habits and type of vehicle. He hypothesizes that signaling behavior will be different for drivers of trucks and cars. The data from observations made while driving are given below. Calculate the two-variable Chi-square test. State the null hypothesis, alternate hypothesis, find the Chi-square critical value (for alpha of 0.05), and present the statistical decision.
Vehicle Type
Signal Cars Trucks
Yes 190 267
No 183 209
2. The national graduate rate for state police academies is 90%. In the latest graduating class of Big State Police Academy, 240 of 300 cadets graduated. Teh state governor has begun an inquiry into the low rate of graduation. But, first, he has asked you to determine if the difference in rates is significant or due to chance. Use an alpha of 0.01 for a two-tail test of significance.
3. A prison has been selected for study by a state regulatory agency that monitors job placement training and success. Nationally, 35% of those released on parole are still employed one year after release. A sample of 300 parolees indicated that 126 are still employed after one year. Is this prison's job training program better, worse, or no different from the national average? Use a two-tailed test with an alpha of 0.05.
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
The least squares simple linear regression line minimizes the sum of the vertical deviations between the line and the data points.
Within distribution of scores, measures of dispersion give an indication of?
The model that result is: y= 0.6 + 1.2x, where the dependent variable is the amount of sales, in thousands of dollars, realized during the week and the independent variable is the amount spent on newspaper advertising, in hundreds of dollars, duri..
Calculate the mean and standard deviation of the sample mean based on data from 100 stores.
How many treatments are there? What is the total sample size? Is there a significant difference at the 5% Level of significance? Would I accept or reject the null Hypothesis.
A researcher is interested in the effect of an electrolytic sports drink on the endurance of adolescent boys. A group of 30 boys is selected and half are given a treadmill endurance test while consuming the sports drink and the other half take the..
Using quadratic regression model find the estimated number of planes.
In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that:
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
At.05 level of significance, is there evidence to propose that mean life length of the batteries manufactured by this manufacturer is more than 400 hours?
Merrill Lynch Securities and Health Care Retirement, Inc., are two large employers in downtown Toledo, Ohio. They are considering jointly offering child care for their employees.
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