How does a confidence interval differ from a prediction interval?

How does a confidence interval differ from a prediction interval?
 
  A) Confidence intervals are used to measure the accuracy of the mean response of all the individuals in the
  population, while a prediction interval is used to measure the accuracy of a single individuals predicted
  value.
  B) Confidence intervals are used to measure the accuracy of a single individuals predicted value, while a
  prediction interval is used to measure the accuracy of the mean response of all the individuals in the
  population.
  C) Confidence intervals are constructed about the predicted values of y while prediction intervals a
  constructed about a particular value of x
  D) Confidence intervals are constructed about the predicted values of x while prediction intervals a
  constructed about a particular value of y

Q. 2

One of the requirements for conducting inference on the least-squares regression model is that the
 
  A) mean of the response variable changes at a constant rate while the standard deviation remains constant.
  B) mean of the explanatory variable changes at a constant rate while the standard deviation remains
  constant.
  C) mean of the response variable remains constant while the standard deviation changes at a constant rate.
  D) mean of the explanatory variable remains constant while the standard deviation changes at a constant
  rate.

Q. 3

True or False: As the level of confidence increases the number of item to be included in a sample will decrease when the error and the standard deviation are held constant.
 
  A) False B) True

Q. 4

A medical journal published the results of an experiment on insomnia. The experiment investigated the effects of a controversial new therapy for insomnia.
 
  Researchers measured the insomnia levels of 40 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the womens insomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. What type of experimental design is this? A) matched-pairs design B) completely randomized design
  C) randomized block design D) single-blind design

Q. 5

Assuming that all conditions are met to approximate a binomial probability distribution with the standard normal distribution, then to compute P(12  x  15 ) from the binomial distribution we must compute as the normal approximation.
 
  A) P(11.5 < x < 15.5 ) B) P(12.5 < x < 14.5 )
  C) P(x > 15.5 ) and P(x < 11.5 ) D) P(x > 12.5 ) and P(x < 14.5 )

Q. 6

In linear regression, what is the unbiased estimator of  called?
 
  A) standard error of the estimate B) standard deviation
  C) variance D) sample standard deviation