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Question: The effects of two stimulant drugs. An experimenter was interested in investigating the effects of two stimulant drugs (labeled A and B). She divided 20 rats equally into 5 groups (placebo, Drug A low, Drug A high, Drug B low, and Drug B high) and, 20 minutes after injection of the drug, recorded each rat's activity level (higher score is more active). The following table summarizes the results:
(a) Plot the means versus the type of treatment. Does there appear to be a difference in the activity levels? Explain.
(b) Is it reasonable to assume that the variances are equal? Explain your answer, and if reasonable,compute sp.
(c) Give the degrees of freedom for the F statistic.
(d) The F statistic is 4.28. Find the associated P-value and state your conclusions.
The Vice-Chancellor of the University of the Sunshine Coast claimed that the average cost of rental accommodation in the area close to campus was $145 per week. The Student Guild, being sceptical about the validity of this claim, took a random sam..
A company claims that on average, when exposed to its toothpaste, 45% of all bacteria related to gingivitis is killed.
Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. Find the probability that a randomly selected TV will have a replacement time less than 5 years.
The length of the rods coming out of our new cutting machine can be said to approximate a normal distribution with a mean of 10 inches and a standard deviation of .2 inch find Find the probability that a rod will have a length of less than 10.inch..
Consider a hypothesis test of H0: μ = 800 versus H0: μ, 800 with α = 0.025. Find the probability of a type II error and the power of this test for μ = 775; that is, find β(775) and π(775).
What are the assumptions regarding an ANOVA test and what Excel aid would you use to perform the test, Data Analysis or MacDoIt? What are the assumptions regarding a Chi-square test?
you conducted a chi-square goodness of fit test in your asci 691 capstone project. unfortunately you did not get the
(a) Xn D the number of sixes obtained up to the nth roll; (b) Xn D the number of rolls, at time n, that a six has not been obtained since the last six. Prove or disprove that each fXng is a Markov chain, and if they are, obtain the transition probabi..
the owner of the pizza palace wishes to include in an advertisement a statement about the number of different kinds of
A veterinarian collects data on the number of times race horses are raced during their career. The researcher finds the average number of races a horse enters is = 15.3 with a standard deviation of s = 6.8 in a sample of n = 20 horses. The standard e..
Calculate the residuals and plot them versus month. Describe the pattern and explain what the residual plot tells you about the relationship.
Imagine that you are managing a project that involves the development of a new football stadium that will support both the Balitimore Ravens & Washington Redskins (similar to what has been done in New Jersey for the NY Jets/Giants).
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