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compute the correlation coefficient for the data belowx values -3 1 2y values 4 6 -2
solutions: a)-0.227 b)0.431 c)-0.454 d)-0.159
what is the equation for the regression line if n=7, Ex=69, Ey=528 Exy=4754 and Ex^2=825
solutions: a)y'=-3.110+106.089xb) y'=-2.168+109.638xc) y'=109.638-2.168xd) y'=106.089-3.110x
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
When writing about the probability that it will rain in Boston on July 4 of next year, a newspaper reporter states that the probability is ½, because either it will rain or it will not.
The comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
A standard deviation of $125. A) what is the point estimate of the population mean? B) develop a 95% confidence interval for the population mean.
That successive pitches are independent of oneanother. Knowing this, the opposing team manager has instructed his hitters to not swing at anything. The better walks on the fourth pitch.
What is the predicted blood pressure for an average 17 year old as estimated from the regression line? And the standard error of the estimate for a 17year old ?
Federal administration stated that unemployment level in US is 8.6% (population proportion = 0.086). A hypothesis test is to be performed to decide whether unemployment level in NY State differs from national level.
A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families.
Assume that the histogram for Math SAT scores is symmetric and concentrated about 450. Estimate the percent of students who score higher than 650 of the Math SAT.
At the 0.05 significance level, can Ms. Bridgend conclude that she is earning an average of more than $20 in tips?
What is the probability that none of the three parents condones spanking as a regular form of punishment for their children? Give the mean and standard deviation of x. Interpret the results.
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