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If you had the chance to set up a simple experiment at your workplace to test a hypothesis, would you have your research design focus on group comparison (e.g., t-test), pre-post change (e.g., paired t-test), or correlation between variables (e.g. Pearsons)? Why would you prefer this approach?
a random sample of size 9 is collected from a normally distributed random variable. the sample mean is 6.507 and the
question to study the effect of temperature on yield in a chemical process four batches were produced at each of
5000 light bulbs each with an average life of 500 hours, standard deviation is 100 hours. Find the percentage of bulbs that can be expected to last between 540 hours and 780 hours.
The shell thicknesses of the eggs produced by a large flock of hens follow approximately a normal distribution with mean equal to 0.38 mm and standard deviation equal to 0.03 mm. Find the 95th percentile of the thickness distribution.
Calculate the difference in the average clutter between network and cable television and which standard deviation would lead you to conclude that there was a major difference in the two clutter averages? Comment.
A) Determine the probability that at least 4 of the 155 golfers would get a hole in one on the sixth hole. Discuss
A survey is being planned to estimate the prevalence of secondary infertility amongst couples aged 20-45. The investigators expect the prevalence to be 10%, and would like to estimate it to within 5% of the true value (with 90% confidence). How many ..
What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)
Perform pair wise comparisons of the treatment means by computing a Tukey simultaneous 95 percent confidence interval for each of the pair wise differences μ1 - μ2, μ2 - μ3, and μ2 - μ3. Which type of program content results in the worst mean bran..
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 185 and a standard deviation of 12.
A psychologist has to develop a new test of spatial perception, and she wants to estimate the mean score achieved by male pilots. How many people must she test if she wants the sample mean to be in error by no more than 2.0 points, with 95% confid..
Formulate this statement as a multiple regression model (form only, without parameter estimation).
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