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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).
Describe the difference in the fit provided by the two estimated regression equations.
Consider a large population of families with three children each. If the genders of children in any family are independent of one another, the number of male children in any family will have a binomial distribution based on three trials.
Probabilities can be approximated by the normal probability distribution? Explain What is the probability of between 100 and 110 successes? What is the probability of 130 or more succeses?
chi-square test for independence of attributes.an investment portfolio manager categorized her investors as having
According to news reports, Las Vegas betting parlors increased the number of proposition (prop) bets available to gamblers for this year's Super Bowl (Example: Which team will be the first to suspend a starting player for a team rules violation?).
1.to assess the accuracy of a kitchen scale a standard weight known to weigh 1 gram is weighed a total of n times and
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.
the college board reported the following mean scores for the three parts of the scholastic aptitude test sat the world
in a gallup poll of 1003 randomly selected subjects 373 said that they have a gun in their home. the accompanying
What is the probability that the 100 randomly selected mangoes have a mean weight less than 14 ounces?
The floor plan of a house is rectangular. The house's length is 2x-10 and its width is x+3. Write an expression for the area of the house
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
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