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Q1) Report of a study of seat belt use by drivers says, "Hispanic drivers were not considerably more likely than White/non-Hispanic drivers to over report safety belt use (27.4 vs. 21.1%, respectively; z = 1.33, P > 1.0." How do you know that P-value given is wrong? Determine the correct one-sided P-value for test statistics=1.33?
Q2) Another student, when asked why statistical significance appears so often in research reports, says, "Because saying that results are significant tells us that they cannot easily be explained by chance variation alone." Do you think that this statement is essentially correct? Explain your answer.
Q3) You read that statistical test at α=0.01 level has probability 0.14 of making a Type II error when specific alternative is true. Calculate the power of test against this alternative?
What is Peter's median grade point at graduation? What is the shape of the grade point distribution?
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
Suppose that during a basketball practice. Joe tries 3 shots from the free throw line; imagine further that he has a probability equal to 0.6 of making each shot and that the attempts are independent. Let 'X' be the number of baskets he makes in t..
Create a hypothesis and perform a series of tests to determine if there is any fundamental difference in the findings.
would this prove that they are exceeding their goal, using α = .025?
Using the data file below, construct a histogram and a frequency polygon. Describe the shape of this distribution.
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
Forecast the number of deliveries utilizing exponential smoothing constant for different values also compare it. A hospital records the number of floral deliveries its patients receive every day.
Using alpha = 0.05 and a computed value of +4.49, can we conclude that the percentage of claims for married policyholders is less then for single policyholders?
We are interested in determining if the accident proportions differ between the two age groups:
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
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