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In CaliforniaSpeeding.jmp are recorded speeds (in miles/hour) of a randomly selected sample of cars traveling on a section Highway 405 in Los Angeles (based on data from Sigalert). That part of the highway has a posted speed limit of 65 miles/hour. Assume that the standard deviation of speeds is 5.7 miles/hour and use a 0.01 significance level to test the claim that the population mean is greater than 65 miles/hour. Write a brief paragraph to summarize your findings
Define or give an example of a hypothetical construct. Explain why operational definitions are needed to define and to measure constructs.
ACME Lumber Company selects a random sample of 36 customers. Customers are rated on their annual spend at ACME Lumber Stores.
A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviation was 10. The scores are normally distributed.
Is this sample sufficient to conclude that the eye spots have a significant influence on the birds behavior? Use a two tail test with alpha =.05. Compute the estimated Cohen's d to measure the size of the treatment.
Playbill magazine reported that the mean annual household income of it's readers is $219,155. Assume this estimate of the mean annual household is based on a sample of 91 house-holds and based on past studies,
Each year the local country club sponsors a tennis tournament. Play starts with 128 participants. During each round, half of the players are eliminated.
Super Markets, Inc. is considering expanding into the Scottsdale, Arizona, area. Ms. Luann Miller, Director of Planning, must present an analysis of the proposed expansion to the operating committee of the board of directors
Should Katie conduct a between-subject ANOVA or a within-subject ANOVA? Describe your answer.
If probability of demand for 50 units is .40, probability of demand of 100 units is .50, and probability of demand for 150 units is .10, what lot size would you recommend if the goal is to maximize expected profit?
The confidence interval for proportion of adults who approve of the candidate is ____
The engineer in a widget factory wants to test out a new form of raw materials. So a batch of widgets are made in the old manner as a control group and then a batch are made with the new materials as a comparison.
If the manufacturer sells the parts in packages of 10 parts, what are the mean and standard deviation of the number of useable parts in a package?
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