Biology Forums - Study Force

An alternative or research hypothesis is an assertion that holds if the null hypothesis is false.
  Indicate whether the statement is true or false

Q. 2

If the Durbin-Watson statistic has a value close to 4, which assumption is violated?
 a. Homoscedasticity
  b. Normality of the errors
  c. Independence of errors
  d. None of these choices.

Q. 3

A null hypothesis is a statement about the value of a population parameter.
  Indicate whether the statement is true or false

Q. 4

If the Durbin-Watson statistic, d, has values greater than 2, this indicates
 a. a positive first-order autocorrelation
  b. a negative first-order autocorrelation
  c. no first-order autocorrelation at all
  d. None of these choices.

Q. 5

An engineer for an electric fencing company is interested in the mean length of wires being cut automatically by machine. The desired length of the wires is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. Suppose the engineer decided to estimate the mean length to within 0.025 with 99 confidence. What sample size would be needed?

Q. 6

If the Durbin-Watson statistic d has values smaller than 2, this indicates
 a. a positive first-order autocorrelation
  b. a negative first-order autocorrelation
  c. no first-order autocorrelation at all
  d. None of these choices.

Ans. #1

T

Ans. #2

C

Ans. #3

T

Ans. #4

B

Ans. #5

n = 240 (using z = 2.58)

Ans. #6

A

Amazing, correctly answered