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In the population, the average IQ is 100. A team of experimenters wants to test a new pill to see if it either has a positive or negative effect on intelligence, or not effect at all. A sample of 30 participants who have taken the pill has a mean of 140 with a standard deviation of 20. Did the pill affect intelligence? Lets say a= 0.05
Question: Identify the independent and dependent variables and at least one potentially confounding variable. State how the confounding variable(s) might be controlled.
If you know you need a sample size of 1,063 out of 300,000 to get a 95% confidence level and a 3% confidence interval what steps would you take to get a random sample?
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1000 people from the same population found that 550 were pro-life (i.e. 55%), which would you find to be more significant? Why?
giving a test to a group of students the grades and gender are summarized
Named let'' is a variant of let that has the form he and are just as in ordinary let, except that is bound within to a procedure whose body is and whose parameters are the variables in the. Thus, one can repeatedly execute the by invoking ..
In a test for ESP (extrasensory perception), the experimenter looks at cards that are hidden from the subject. Each card contains either a star, a circle, a wave, or a square. As the experimenter looks at each of 20 cards in turn, the subject name..
A friend has performed a signi?cance test of the null hypothesis that two means are equal. His report states that the null hypothesis is rejected in favor of the alternative that the ?rst mean is larger than the second.
the average gas mileage of a certain model car is 30 miles per gallon. if the gas mileages are normally distributed
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
What do high and low values of kurtosis imply for the shape of a frequency distribution? Draw a diagram to illustrate your answer.
the mean gross annual income of certified welders are normally distruted with the mean of 20000 and a standard
according to a survey of 25000 households conducted by nielson company 51 of the people watching the 2010 super bowl
a study is run to estimate the association between exposure to lead paint in childhood and attention-deficit
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