Cumulative Exam — Cumulative exam Answers

Consider the system of linear equations and the matrix equations below. What is the value of x in the equation?

The College Board states that the average math SAT score is 514 with a standard deviation of 117. Colleen gathered data from 50 students in her graduating class and found the average score to be 529. She thinks that her class’s math SAT score is different from the average. Which of the following shows the correct z-statistic for this situation?

What is the simplified form of the following expression?

David is a statistician. He has a sample size of 40 (which he cannot change). What element of his hypothesis test can he adjust to minimize the probability that he incorrectly rejects the null hypothesis?

Which is equivalent to cos-1(0)? Give your answer in radians.

What is the solution of ?

What is the determinant of ?

Which of the following shows the true solution to the logarithmic equation

According to the Fundamental Theorem of Algebra, how many roots exist for the polynomial function?f(x) = (x3 – 3x + 1)2

The polynomial equation has complex roots . What is the other root? Use a graphing calculator and a system of equations.

A supervisor finds the mean number of miles that the employees in a department live from work. He finds and . Which mileage is within a z-score of -1.5?