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1) Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.
2) Describe each of the following types of designs, explain its logic, and why the design does or does not address the selection threats of Trochim and Donnelly (2006):
a. Non-equivalent control group pretest only b. Non-equivalent control group pretest/posttest c. Cross-sectional d. Regression-Discontinuity
At least half the patients are under 15 years old? First, describe how this can be modelled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20 percent.
The following data shows the packages gathered for delivery for ten days and the proportion of packages received not delivered to the customers at expected time.
10 cartons are taken at random from an automatic filling machine.The mean net weight of the carton is11.8 kg and standard deviation of 0.15kg. Does the sample mean differ significantly from the intended weight of 12kgs?
If the sum of the squared deviations about the regression line is SSE = 40.0, what is the coefficient of determination?
In study of a clinical for an allergy drug 115 of the 204 subjects reported experiencing important relief from their symptoms.
Fit a multiple linear regression model for predicting the hospital duration using age, sex, body temperature, white blood cell counts, antibiotic use, blood culture and service
what will be the standard deviation of the share price if it is assumed that there is a 95% probability that the value will be at least 64?
What is the probability that none can transact business in a foreign language?
It is very difficult for small businesses to be successful. The Small business administration estimates that 20 percent will dissolve or go bankrupt within two years. A sample of 50 new businesses is selected. (show work) (a) What is the mean and ..
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
The following table shows the number of miles driven in each trial.
Find the test statistic value for two mean tests using equal variance formula.
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