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A researcher is investigating effectiveness of new study-skills training program for elementary school children. Sample of n= 25 third grade children and each child is given standardized achievement test at end of year. For regular population of third grade children, scores on test form normal distribution with mean of µ = 150 and a standard deviation of σ = 25. Mean for sample is M = 158.
a. Draw the suitable distribution, and locate critical regions for α = .05.b. Compute test statistics (z score) for sample.c. What decision must be made about effect of program?
A company that manufactures computer chips wants to use a multiple regression model to study the effect that 4 different variables have on y, the total daily production cost (in thousands of dollars).
Nationwide, GMAT scores in a particular year had an average of 528 with an SD of 112 and the scores roughly followed a normal curve. If a student scored 600 on the exam, approximately what percentage of test-takers scored below this student?
Let X be the number of kings selected and Y the number of jacks selected. Find the joint probability distribution function.
Describe five data collection techniques in your own words. Be sure to cite any sources you used. Explain why the examination of collected data is so important.
Market researchers use it by correlating product attribute ratings with a dependent measure such as overall satisfaction. They then rank the product attributes to determine which attributes are the most important. They call this Key Driver Analysi..
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5
What is the probability that the cereal would be high fiber? In other words, what is P (high fiber)?
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
A person makes random guesses for 10 true-false questions on a test. Find the probability that the student answers at least one question correctly.
Many vehicles used in space travel are constructed with redundant systems to protect the flight crew and their equipment. Find the probability that this shuttle component functions successfully if n = 2.
Find the area under the normal distribution curve to the right of z = -1.03.
Suppose that the number of babies born during an hour at a hospital's maternity wing follows a Poisson distribution with a mean of 4 per hour.
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