Given that X is a binomial random variable with very large n, the binomial probability P(X = 5) is ...

Given that X is a binomial random variable with very large n, the binomial probability P(X = 5) is approximated by the area under a normal curve between
 a. 5 and 5
  b. 4 and 6
  c. 4.5 and 5.5
  d. None of these choices.

Q. 2

In performing a regression analysis which of the following must be true about the distribution of the error variable?
 a. The distribution is normal with mean zero.
  b. The errors associated with one y value are independent of errors associated with another y value.
  c. The standard deviation is constant for each value of x.
  d. All of these choices are true.

Q. 3

In general, the binomial probability P(X  x) is approximated by the area under the normal curve to the left of x - .5.
  Indicate whether the statement is true or false

Q. 4

In simple linear regression, the coefficient of correlation r and the least squares estimate b1 of the population slope 1:
 a. must be equal.
  b. must have the same sign.
  c. are not related.
  d. None of these choices.

Q. 5

In general, the binomial probability P(X  x) is approximated by the area under the normal curve to the left of x + .5.
  Indicate whether the statement is true or false