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You conducted a t-test in your research. You did not find a statistically significant difference between your groups even though your sample size was relatively small. Upon conducting a post hoc power analysis you found that your actual power was 0.57. What should you do? Is there a problem with having a power less than 0.80 when you do not have significant differences?
The population of car speeds is approximately normally distributed. Determine a 90% confidence interval estimate for the speed of all cars.
A researcher demonstrated a correlation of r = 0.60 between teacher attire and student academic performance across 150 grade schools in her state.
Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi).
1.For a sample size of 100 determine the crtitical value for a two-tail hypothesis test at a 5% level of significance when the population standard deviation is unknown
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
Test the assumption of collinearity.
How large a sample size, n, should they recruit in order to obtain a confidence interval with margin of error ± 3% based on this prior guess?
problem based on decision tree.a manufacturer must decide whether to extend credit to a retailer who would like to open
Effect of Family Income on a Student's S.A.T. Score and salary Discrimination in the National Basketball Association
A large university says the mean number of classroom hours per week for full-time faculty is more than 9. A random sample of the number of classroom hours for full-time faculty for one week is listed. At 945; = 0.05 , test the university's claim.
Draw the histogram for these data using an initial class boundary of , an ending class boundary of , and classes of equal width.
q1. consider throwing 2 usual dice. in each play we observe the number of dots that stay on top sum the returned result
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