1..A programmer plans to develop a new software system. In planning for the operating system that he willuse, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 95% confident that his estimate is in error by no more than two percentage points?Assume that nothing is known about the percentage of computers with new operating systems.

2..Thechi-square distribution is symmetric.

True

False

Thechi-square distribution is different for different sample sizes.

True

False

The mean of thechi-square distribution is 0.

True

False

The values ofchi-square can be zero orpositive, but they cannot be negative.

True

False