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A researcher conducts a study of perceptual illusions under two different lighting conditions. Twenty participants were each tested under both of the two different conditions. The experimenter reported: "The mean number of effective illusions was 6.72 under the bright conditions and 6.85 under the dimly lit conditions, a difference that was not significant, t(19) = 1.62."
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The mean of a normal distribution probability is 400 pounds. The standard deviation is 10. What is the area between 415 pounds and the mean of 400 pounds? (Round to 4 decimals)
The test scores of a student who took both tests are given below. A student gets a 75 on the statistics test and a 29 on the biology test. transform each test score to a z-score.
Camera batteries has a standard deviation of 2.1 months. Assume the variance is normally distributed. Do you fell that the lifetimes of the batteries are relatively consistent?
In considering doing a logistic regression using the Enter method, it was suggested that I may want to consider doing a sequential LSR or stepwise logistic regression instead.
Due to all the unceratinties in government health care legislation, shouldice would like to justify any expansion within a five-year time period. How would I set this problem up?
Her students this semester can be considered a sample from the population of all students she might teach, so she compares their mean score with 72.
Management announce an incentive pay for the top 30% producers. what is the minimum number of units that a worker should produce in order to qualify for the incentive pay?
Using your workplace, present or prior, or an organization with which you are affiliated, identify a dependent variable and an independent variable of interest to you
Investigators followed a population of 2,000 women aged over 65 years who did not have osteoporosis, over a 10-year period and measured the number of cases of osteoporosis diagnosed during that time-period. The investigators were interested in the ef..
If you assume returns follow a normal distribution, which investment would give a better chance of getting at least a $40 million return? Explain how your answer could change if you knew returns followed a skewed distribution instead of a normal d..
A state meat inspector in Iowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled "3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
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