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USE this rule Crit > Calc = Cannot Reject = No Statistical difference in the meansCrit < Calc = Reject = Statistical difference in the meansQuestion 1: Historically, my HRV fleet averaged 40,000 miles between breakdowns with a 8000 mile standard deviation. I implemented Continuous Improvement teams to research better inspection methods and after the kaizen, I sampled, randomly 30 HRV cars and found 43,000 miles between service interruptions. Test at the 0.05 Alpha I tail Z test and determine if the efforts paid off statistically
At the 0.01 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 49 months? Perform a two-tailed test.
Use the significance level of alpha = .05 to test claim that p > .5. Sample is simple random sample n = 50. Illustrate how to compute beta for test and suppose true population proportion is .6.
Describe the sampling distribution of p-hat, the sample proportion of college students with the cell phones who send or receive the text messages with their phones.
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
You are conducting an evaluation of services at a social service agency. One of the evaluation issues is finding out whether male clients rate the quality of casework services as highly as do female clients.
Using the Wilcoxon Signed-Ranks Test. Paired sample data and use the Wilcoxon signed-ranks test to test the claim that the matched pairs have differences that come from a population with a median equal to zero.
The Department asks you to estimate a model that could ?t this situation. a) Do you think that a multinomial logit is a suitable model for this problem? Explain why.
Given the following data, calculate the EMV for each investment alternative. Which is best based on the EMVs you calculated?
In estimating a 95% confidence interval estimate of the average number of days absent for the company's workers last year should you use a z or t value in the formula?
You do not need to collect data and actually conduct the test calculations. Rather,state the claim, define the null and alternate hypotheses, identify the test significance and the test statistic, and state the decision rule that will be used.
An important idea in data interpretation is choosing which graph to use under which circumstances. Describe the benefits of different graphs for different sets of data:
How many adults must be randomly selected to estimate the mean driving time of Chicago commuters? We want 99% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is known to be 8 minute..
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