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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.
Find out the confidence interval for the population mean also interpret the result. A researcher is interested in whether social assertiveness might be influenced by training procedures.
Explain what these terms mean in describing the distribution of the sales reps' salaries.
A Hot Fudge Sundae has on average 12 ounces of ice cream. If I were to set up a hypothesis test to test the ability of a new employee making the hot fudge sundae with an average of 12 ounces of ice cream
What happens to the confidence interval and the power of the test at a particular point of interest
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
In a certain distribution of numbers the mean is 60 with a standard deviation of 8. Use Chebyshevs theorum to tell the probability that a number lies in each interval.
What is the value of the test statistic and decision? Show step by step on how you obtained your final answer.
How would a decrease of $1 in the x1 coefficient of the objective function affect the optimal values of the decision variables?
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
Sales manager wishes to award sales representatives who earn the largest commissions a bonus of= $1,000 .He can award bonus to 20% of representatives. Determine cutoff point between those who earn bonus and those who don't?
A bag contains 4 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue?
Generate survival times X from an exponential distribution with rate lambda=1 with a censoring distribution C being exponential with rate theta = 2/3. Then Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000..
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