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You are presenting the results of a research paper at a regional meeting. Your study was focused on the relationship between medication and depression level. You tell your audience that you ran a t-test to compare the depression levels of 1000 people taking the medication to 1000 people not taking the medication. You point out that the mean level of depression for medication users is 10.1 and the mean level of depression for non-users is 10.8. You announce to your audience that this finding is significant at the .05 level.
(a) Some doofus stands up and says, "What do you mean you did a t-test? What good is that? You can just look at the numbers and see they are different. Why did you have to do any kind of test?" How would you respond (3 or 4 sentences).
(b) Because some people are only happy when they are arguing, this guy throws another question at you. He says, "What do you mean the findings are significant? The numbers for the two groups are practically the same. I would hardly call that significant! It is barely meaningful! Also, what is this .05 level of which you speak? Are you just trying to confuse us with your statistical mumbo jumbo?!?" How would you respond (3 or 4 sentences).
The time, in hours, that a copying machine may work without breaking down is the normally distributed random variable with mean 549 and the standard deviation 68.
in a certain town 10 of the families have no children 10 have one child 40 have two children 30 have three children and
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
the following data represents the travel time in minutes to school for nine students enrolled in sullivans college
What will be measurable data in this case and (assume a survey will be conducted and or data can be obtain). What will be at least two independent variables and one dependent variable. (and assuming they are consistent with the collected data)
A pilot survey revealed that 5 of the 50 sampled hold two or more jobs. How many in the workforce should be interviewed to meet your requirements?
If one of the 100 employees is randomly selected, find the probability of getting someone who carpools, someone who cycles to work, or someone who works part time.
Determine mean and standard deviation for number of erroneous returns per batch.
Find the probability that an individual graduate will have a salary over $45,000. A group of nine graduates will have a group average over $45,000.
the dean would like to get a summary of gender and final grade for this class. discuss the forms of numerical and
question a process for the manufacture of penicillin was studied. there were five variants of the basic process being
in a recent study of 35 ninth-grade students the mean number of hours per week that they played video games was 16.6.
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