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Twenty students randomly assigned to an experimental group receive an 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 (with an estimated population standard deviation of 3); the control group has a mean of 35 (with an estimated population standard deviation of 5). Using the .05 level, what should the experimenter conclude? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved, and (c) explain your answer to someone who is familiar with the t test for a single sample but not with the t test for independent means.
Write the event "at least one nonword error" in terms of X. What is the probability of this event? Describe the event X ≤ 2 in words. What is its probability? What is the probability that X
What are the differences between a two sample t-test and ANOVA hypothesis testing? What is an example of a research idea that would need to be analyzed using an ANOVA?
Given that Z is standard normal randam variable. Compute the value of Z if area between –Z and Z is 0.754:
The heights, in feet, of the five tallest buildings in four large cities are compared. What is the critical value if the level of significance is 0.10?
Suppose a simple random sample of size 50 is selected from a population with σ= 10. Find the value of the standard error of the mean in each of the following case?
A general contractor is considering purchasing lumber from one of two different suppliers. A random sample of 12 "2x4's" of a certain length of each board is measured.
Calculate a 3-period moving average for period 7. Compute the MAD of the forecast.
A production line operates with a mean filling weight of 500 grams per container. Over filling or under filling presents a serious problem and when detected requires the operator to shut down the production line to readjust the filling mechanism.
Angela works as a quality supervisor. She has uncovered a quality issue with safety brackets on baby swings. Angela determines that 21% of the safety brackets are out of spec.
Standard deviation of 7. At 0.01 significance level, is there more variation in first population?
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
How many ways can this happen if one person will win a new pencil, another will win a trip to McDonalds, another will win a weekend in Chicago, and the final prize is an automatic 4.0 in Math class.
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