At a computer manufacturing company, the actual size of computer chips is normally distributed with ...

At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the standard error for the sample mean?

A) 0.120 B) 0.091 C) 0.029 D) 0.050

Q. 2

Major league baseball salaries averaged 3.26 million with a standard deviation of 1.2 million in a recent year. Suppose a sample of 100 major league players was taken. Find the approximate probability that the mean salary of the 100 players was less than 2.5 million.

A) 0.9849 B) approximately 1 C) approximately 0 D) 0.0151

Q. 3

The variance of the sum of two investments will be equal to the sum of the variances of the two investments when the covariance between the investments is zero.

Indicate whether the statement is true or false

Q. 4

The variance of the sum of two investments will be equal to the sum of the variances of the two investments plus twice the covariance between the investments.

Indicate whether the statement is true or false

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At a computer manufacturing company, the actual size of computer chips is normally distributed with ...

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