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Two samples of sizes 25 and 35 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal. What are the number of degrees of freedom of the equal-variances t test statistic?
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population means, but your statistical software provides only a one-tail area of 0.036 as part of its output. The p-value for this two - tail test will be:
a. 0.018
b. 0.009
c. 0.072
d. 0.964
A random sample of 36 drinks from a soft drink machine has an average content 7.6 ounces with an standard deviation of 0.48 ounces. Test the hypothesis ounces against the alternative hypothesis at the 0.05 level of significance.
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
A researcher wanted to invetigate whether there is a significant difference in the average age of instructors, assistant professors, assocated professors and full professors at a university. The faculty was selected at random and their ages were r..
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following
Using goodness-of-fit test and.01 level of significance, find out whether accidents are evenly distributed all through the day. Write a short description of your conclusion.
Discuss what is meant by mean, median, mode, variance, and standard deviation for a set of scores. Also mention under what circumstance you would use each of these.
The width of a confidence interval will be:
Is there a significant difference in the average prices for these two different supermarket chains? Test at α = 0.05
Hamburger Joe's sells the best burgers in town. The variable unit cost for making one burger is $.97. The fixed cost of making burgers for 12 months will be a total of: $140,000.
Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000
If you are using exponential smoothing for forecasting an annual time series of revenues, what is your forecast for the next year if the smoothed value for this year is $32.4 million?
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