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Now the group is 4500 people and 1000 of them are left-handed. As before, eight of them are selected and X - the number of left-handed among 8 - is recorded.
a) Argue why now the distribution of X has a different form than in Problem
1.
b) Calculate P{X>=4}, E(X) and Var(X). Comment on changes in values of E(X) and Var(X) between Problem 1 and 2.
c) Use empirical rule to calculate the interval, where 95% of the values of random variable X will be.
suppose probability samples of size n2 are selected from 1 2 3 4 with probabilities d1.4 d2.4 d3.1 and d4.1.
consider the following summary data on the modulus of elasticity times106 psi for lumber of three different grades in
At 0.05 level of significance, is there evidence of noteworthy difference in variation in sales among different aisle locations?
Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options?
A cabinet has 3 identical drawers. One drawer contains 2 gold coins, another drawer has a gold coin and a silver coin, and the third drawer has 2 silver coins. (a) What is the chance you get a gold coin?
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in a survey of 500 u.s. adults 45 of them said that lounging at the beach was their dream vacation assuming this to be
a random variable x has mean mu and standard deviation sigma. suppose n independent observations of x are taken and the
what is the probability that the sample mean will be at least 1000? Do you need to use the central limit theorism to answer this question? explain.
a bleary-eyed student awakens on morning late for an 800 class and pulls two socks out of a drawer that contains two
what is the difference between a population linear model and an estimated linear regression
Obtain the estimated regression function. Plot the estimated regression function and the data. Does a linear regression function appear to give a good fit here?
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