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Can someone please help me with finding these critical z scores.
1. What is z (critical) for a positive one-tailed test with an alpha of .05?
2. What is z (critical) for a negative one-tailed test with an alpha of .01?
3. What is the positive z (critical) value for a two-tailed test with an alpha of .10?
4. What is the negative z (critical) value for a two-tailed test with an alpha of .10?
question for a population of 17 year old boys the mean subscapular skinfold thickness is 9.7 mm and the standard
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The average number of calories in a small chocolate bar is 225. Suppose that the distribution of calories is approximately normal with 10. Find the probability that a randomly selected chocolate bar will less than 200 calories.
a large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1000 hours and
CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 36 randomly selected cameras yielded the following sample values:
The chance both flights are full is 0.6. Are the two flights being full independent events and What was the mean ranking for the females in this class
Suppose you are given a grant to run a controlled experiment. Explain how you would structure the experiment in order to estimate the casual effect of hours on sat.
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If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
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