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Is power directly or indirectly related to the size of the expected effect?
What exactly is 'power' and why is it important?
The committee only think they have enough money for a study of 50 people (25 per group). What kind of power would we have to detect a difference of 1 bout/week (effect size of 0.5)? What are potential consequences of performing a study with too few people (or insufficient power)?
Last year, Tucker Electronics decided to try to do something about turnover among assembly line workers at its plants. It implemented two trial personnel.
Suppose three sample means came from a population with µ = 100 and a fourth from a population with a smaller mean, µ = 50. Will the between-treatments estimate.
What is statistics? What are the branches of statistics? Discuss
What is the probability that the mean height for the sample is greater than 65 ?inches? Assume standard deviation is 2.94.
thickness measurements of a coating process are made to the nearest hundredth of a millimeter. the thickness
What is a variable? List at least five diff erent variables and then describe at least two levels of each variable. For example, age is a variable.
You just saw an ad on television that states the majority of the population would vote to make smoking illegal.
Air-America has a policy of booking as many as 14 people on an airplane that can seat only 12. (Past studies have revealed that only 92% of the booked passengers actually arrive for the flight.)
How can research address the issue on climate change as experienced not only in Philippines but in the whole world?
Suppose that a baseball player's long-run batting average (number of hits per time at bat) is 300. Assuming that each time at bat yields a hit with a consisted
bob a manufacturing plant manager is inspecting the diameters of ball bearings produced by a suspected malfunctioning
Find the coefficient of determination given that the correlation coefficient = -.84 (Give your answer as a decimal rounded to the ten thousandth decimal place.)
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