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One-sided versus two-sided P-values.
Computer software reports x‾ = 15.3 and P = 0.074 for a t test of H0: μ = 0 versus Ha: μ ≠ 0. Based on prior knowledge, you can justify testing the alternative Ha: μ > 0. What is the P-value for your significance test?
Suppose that a random sample of 200 adults found that 110 thought there is too much violence on television. Is this enough evidence to reject the claim? What do we want to know?
The Oakland Bombers professional basketball team just missed making the playoffs last season and believes it needs to sign only one very good free agent to make the palyoffs next season.
Why is horizontal distance, rather than height, the response variable?
Name and explain the contributions of three Abolitionists that supported and helped African Americans before the Civil War fight slavery?
A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white.
Assuming the life length of this type of light bulb is normally distributed, what is the p-value associated with this test?
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 40 people.
By indicating the lower and upper confidence limits for each mean, a graph can convey at a glance the reliability that goes with each point. Calculate a 95 percent confidence interval for each mean.
the probability that an individual has 20-20 vision is 0.15. in a class of 50 students what is the mean and standard
You are the consumer, so what variables do you believe the magazine should have used to make the ratings meaningful to you? Write a short recommendation with your suggestions to the magazine.
in a population of 1000 subjects 800 are unemployed. in the same population 700 of the subjects are males. of the males
How many salaries are in the top 1/3 (rounded to nearest whole number) for each group? What Comparatio value starts the top 1/3 of the range for each group? What is the z-score for this value? What is the normal curve probability of exceeding this sc..
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