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Twenty students randomly assigned to an experimental grorup receive a n instructional program;30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test(est. populationastandard deviation of 3): the control group has a mean of 35(est. population standard deviation of 5). Using the ,05 level, what should the experimenter conclude? a)the the steps od hypothesis testing b)sketch the distribution involved, and c) explain your answer to someone who is familiar with the t test for a single sample but not with the t sest for independent means.
Assume X is an exponential random variable with parameter lambda. Find the method of moments estimator for lambda.
Jack is doing a project in educational psychology. Before the experiment, he rank-orderes all his participants according to achievement test scores.
Create a 95% confidence interval for true mean debt for student borrowers.
A coin is flipped e times and heads (h) or tails (t) are recorded:
Compute the average number of delayed patients, Lq, for this system. The variance of the sum independent random variables is the sum of the variance.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
A t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
A sample of n = 9 individuals was selected from a normally distributed population with a mean of µ = 25 and a standard deviation σ = 6. A treatment was administered to the sample and, after treatment, the nine individuals produced the following sc..
Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
Generate three random observations from the uniform distribution between -10 and 40 by using the following random numbers: 0.0965,0.5692,0.6658
Discussion should include a critical reflection on the way in which you completed the market challenge element of the module.
Suppose that we observe a random sample size n from a normally distributed population. If we are able to reject H0:µ = µ in favor of a two-tailed alternative hypothesis at the 10% significant level
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