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At a certain university, the average cost of books per student was 400.00 last semester. In a sample of 40 students this semsester, their average cost was 340.00 with a standard deviation of 80.00. The dean of students believes that the costs are greater this semester. What is the test value for this hypothesis:
A) 15.00
B) 2.37
C) 0.38
D) 0.75
Test for single Proportion - Are the data consistent with the model? Answer yes or no, and explain briefly.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
A social psychologist is studying college students attitudes toward drinking and driving. He is specifically interested in attitude change as a result of years in college and of viewing the consequences of drinking and driving accidents.
Find the 99% confidence interval for the population proportion.
Determine the rejection region for the test of Ho: (mean 1 - mean 2) > 2.43 Use a = 0.04. z >
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
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Use simple exponential smoothing with α = 0.3 to forecast battery sales for February through May. Assume that the forecast for January was for 22 batteries.
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
Suppose you went to the Bureau of Labor Statistics web site and found several predictors of your salary. State three possible predictors and a simulated multilinear regression equation along with their p-values. What does your p-values tell you ab..
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