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Standardized test scores:
For his Statistics class experiment, researcher J. Gilbert decided to study how parents income affects children s performance on standardized tests like the SAT. He proposed to collect information from a random sample of test takers and examine the relationship between parental income and SAT score.
a) Is this an experiment? If not, what kind of study is it?
b) If there is relationship between parental income and SAT score, why can't we conclude that differences in score are caused by differences in parental income?
401077 Introduction to Biostatistics, Autumn 2016 - Calculate the 95% confidence interval for the population mean depression score in this population and Explain why an independent samples t-test is not recommended in this instance.
If θ1 and θ2 are unbiased estimators of θ, show that θ3=k1θ1+ k2θ2 is biased estimator of θ. What condition must be imposed on constants k1 and k2, so that θ3 is an unbiased estimator of θ?
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
a survey found that womens heights are normally distributed with mean 63.9 in and standard deviation 2.2 in. a branch
a company that manufacturers coffee for use in commercial machines monitors the caffeine content in its coffee. the
1.an old saying in golf is you drive for show and you putt for dough. the point is that good putting is more important
What is the probability that a particular driver had exactly two speeding violations?
Standard deviation of 12 ounces. Find the probability of randomly selecting a newborn child whose weight is less than 107 ounces.
A lot of n items comprises k defectives, and m are chosen randomly and inspected. How must the value of m be selected so that probability that at least one defective item turns up is .90?
suppose that a car rental agency offers insurance for a week that will cost 10 per day. a minor fender bender will cost
To findout 95 percent with confidence interval for the mean amount a citation. Police Chief Aaron Ard of River City reports 500 traffic citations were issued last month.
Use the significance level of alpha = .05 to test claim that p > .5. Sample is simple random sample n = 50. Illustrate how to compute beta for test and suppose true population proportion is .6.
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