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1) A researcher is comparing 4 groups to test if they have the same means. There are 72 data values altogether. The degrees of freedom for the Between(dfB) and the degrees of freedom for the With-in (dfW) are?2) If there are 3 means to be compared, then how many possible different comparisons are there altogether?
A metropolitan school system consists of two districts- north and south. the north district contains 60% of all students, and the south district contains 40% of all students.
Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10). Explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
Joan's nursery specializes in custom-designed landscaping for residential areas. the estimated labour cost associated with a particular landscaping proposal is based on the number of plantings of trees,shrubs and so on to be used for the project.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval
Carry out a hypothesis test to see if our belief can be supported. State the null hypothesis and the alternative hypothesis that we would use for this test.
Assuming that the dogs did better than what would be expected with random guessing, did they do well enough to be used for actual medical diagnoses? Why or why not?
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
In the Cash Now lottery game there are 10 finalists who submitted entry tickets on time. From these 10 tickets three grand prize winners will be drawn.
Show draw a cause-and-effect diagram to organize the possible causes of delayed flight departures into the following maj categories.
The sample average is $97, and the SD is $17. Assume that the repair cost has a normal curve. What is the null hypothesis?
Assume the probability that you will make a sale on any given telephone call is 0.11. Find the probability that you make your first sale on the fifth call, make your sale on the first, second, or third call, and do not make a sale the first three ..
Roll a balanced 8-sided dice and a balanced 6 sided die and add the spots on the up-faces. Call the sum X. What is the probability distribution of the random variable X.
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