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Standardized test scores.
For his Statistics class experiment, researcher J.Gilbert decided to study how parent's income affects children's performance on standardized tests like the SAT. He proposed to collect information from a random example 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 bring to a close that differences in score are caused by differences in parental income?
What are the null and alternative hypotheses in this situation?
In rectangular coordinate system, determine the distance between the points (-4,1) and (8,6).
Calculate the correlation and the regression equation and plot the data in the space provided.
Which of the given properties doesn't apply to theoretical normal distribution?
Construct a 95 percent confidence interval for the true mean.
Make a scatter plot, illustrate the regression lines. Determine the correlation coefficient between husband’s and wife’s education for couples in which wife is employed full time?
Which probability distribution is suitable when sampling without replacement?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
Given this, compute the following probabilities for demand during lead time(DDLT).
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