You are thinking of using a t procedure to construct a 95% confidence interval for the mean of a population. you suspect the distribution of the population is skewed with outliers. which of the following statements is correct?
a. you should not use the t procedure because the population does not have a normal distribution.
b. you may use the t procedure, provided your sample size is large, say at least 40.
c. you may use the t procedure because it is robust to nonnormality.

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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rauschg

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i dont know

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the reason i dont know is because i have not taken this class and for that reason i haven't learned this stuff

hope i could