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1) A regression of attitude toward legalizing marijuana on age (X1) and education (X2) produced the following estimated coefficients and standard errors for a sample of 265 persons:
b1 = -6.24 Sb1 = .346b2 = +0.33 Sb2 = 0.12Test one-tailed alternatives to the null hypotheses that ß2 > 0; use a = .01.
2)
Write a substantive interpretation of the following unstandardized regression equation based on a sample of 743 city residents, where Y is a 10-point scale measuring the number of professional sporting events attended per year. X1 is education, X2 is annual income (divided by $10,000), and X3 is a dummy variable for gender (1=female, 0 = male). The t ratios appear in parentheses.
Y = -8.73 - 0.59X1 + 1.46X2 - 5.40X3 (-3.76) (-1.42) (2.14) (-2.87)
Critically discuss the assumptions, if any, regarding a Chi-square test? What are the assumptions to apply linear regression?
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
Forecast the number of deliveries utilizing exponential smoothing constant for different values also compare it. A hospital records the number of floral deliveries its patients receive every day.
A permutation resample for a two-sample test
Diagnosis tests of medical conditions have several results. The test result can be positive or negative, whether or not a patient has the condition.
An elevator has a design capacity of 2,560 pounds and a posted limit of 16 passengers. The weight of adults is approximately normal with a mean of 150 pounds and standard deviation of 20 pounds.
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
A motor transport company has 50 similar buses. The management suspects that its control of these vehicles is inadequate. What suggestions could you make for investigating vehicle use, and tightening managerial control over the company?
ESPN reported in sample of 1000 homes the proportion of people who watched the Texas v. Ohio State college football game this weekend was .6.
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
Find historical information on the statisticians who developed statistical tests, such as the normal distribution, Student t distribution, Chi-Square distribution
A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test the weight ofthe boxes, a few were checked.
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