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A random sample of the speeds of 245 cars on a highway with one of the highest accidents rates in the country is taken. Can we conclude at the 10% significance level that the variance in speeds exce
In a study to compare the absorption rates of three drugs, A, B, and C, a predetermined dose. What are the treatments and experimental units?
What is the expected number of teachers that will become sick? How many substitute teachers will you have ready during the flu epidemic? Why?
Assuming 250 of each sex, can we conclude that there is a significant difference in the proportions at a 0.05 level of significance?
A hospital conducted a study of the waiting times in its emergency room at the main campus. Use the Tukey-Kramer procedure tom see which ones are different.
In a recent year, the mean wait for repairs for Verizon customers was 36 hours. Is there evidence that the change was successful in reducing the wait time?
The std. dev. of the wages is estimated as being no larger than $1.00. What is the number of personnel records that should be sampled, at minimum, to satisfy the requirements?
Sample of 2009 sedans priced under $20,000. (27,31,30,28,27,24,29,32,32,27,26,26,25,26,25,24). Construct a 95% confidence interval for the population mean, assuming a normal distribution?
Chumash Casino had a game similar to Let's Make a Deal with four possible outcomes. Compute the variance of the amount of money you will lose or gain.
Is this new data sufficient to allow you to conclude that the proportion of investors preferring stocks to real estate has declined from 10 years ago? Conduct your analysis at the 2% significance le
The population standard deviations are unknown but assumed equal. What is the critical t value at the 1% level of significance.
Does age affect the amount of reduction in weight, cholesterol level, fat intake, cholesterol intake, and calories from fat cholesterol?
Assuming that the population standard deviation of claims is $500, test to see if the insurance company should not be concerned (level of significance = .05)
Small relative to intercar spacing and that our experiment begins the instant after the zeroth car goes by. Determine, in as simple form as possible, expressions for the probability that:
If Alison claims that the average times are different (rather than specifically saying that one is greater than the other), how would your result from (a) change? Explain in details.
A high school counselor is interested in the percentage of students who will be going to college. State the 95% confidence interval for population proportion
State a research question for which a single-group post-test only design can yield relatively unambiguous findings.
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
Evaluate the claim of the seller that this plant has fewer than 47 autos rejected per day. Evaluate this at any level you choose but you need to explain what level you are using and why.
The company looked at their budget and decided that they could spend $198,000,000. How much money does each person receive?
Artificially Enhanced MiceLabs is a new company that sells mice who can say "Hello."f a mouse is selected at random, what is the probability that it was both acceptable and produced in Lab 1?
An essential property of concern for a thyme bottle-filling machine is the weight of the thyme in the individual bottles. Compute the first quartile and third quartile.
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
What do the coefficients of the regression line tell you about the relationship between mortgage rates and housing starts?