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The Damon family owns a large grape vineyard in western New York along Lake Erie. The grapevines must be sprayed at the beginning of the growing season to protect against various insects and diseases. Two new insecticides have just been marketed: Pernod 5 and Action. To test their effectiveness, three long rows were selected and sprayed with Pernod 5, and three others were sprayed with Action. When the grapes ripened, 400 of the vines treated with Pernod 5 were checked for infestation. Likewise, a sample of 400 vines sprayed with Action were checked. The results are:
A technician services machines of companies operating in the Phoenix Area. Depending on the type of malfunction, the service call can take exactly 1,2,3,4 hours. The different types of malfunctions occur at the same frequency.
Suppose you are in a class of 120 students. What is the probability that at most 42 students will say that they frequently experience stress in their daily lives?
After treatment is administered to individuals in sample, sample mean is found to be M = 55. Determine Cohen's d measure effect size for both tests (σ = 20 and σ = 10).
Using the original data, estimate the population standard deviation with 90% probability.
a committee is to consist of 50 randomly chosen united states senators. find the expected number of different states to
a computer system requires all uses to log on using a 6 character password. if each character can be either a digit
Formulate the null and alternative hypotheses for this application.
Find the most powerful predictor among the six independent variables using regression.
Find the confidence interval of the true proportion of students to receive a 3.0 GPA. Find the Z score, standard error, range, and your conclusion in a sentence.
Evaluate the regression assumptions of linearity and homoscedasticity by assessing your new residual plot. Be specific about your evaluation
Test the hypothesis that the proportion of all student cell phone users in the United States who own a smartphone is 35%. Use the 5% level of significance and report your results.
What are some typical applications of the Binomial and the Poisson probability distribution? Explain with examples. When is the Hypergeometric distribution used?
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