Biology Forums - Study Force

Briefly discuss the assumptions for inferences about the population median using the sign test.

Q. 2

Using the standard normal curve, the z-score representing the 90th percentile is 1.28.
  Indicate whether the statement is true or false

Q. 3

A Type I error is committed when we:
 a. reject a true null hypothesis
  b. reject a false null hypothesis
  c. don't reject a false null hypothesis
  d. don't reject a true null hypothesis
  e. do none of these

Q. 4

A restaurant has collected data on which of two seating arrangements (A and B) its customers prefer. In a sign test to determine which one seating arrangement is significantly preferred, the null hypothesis would be: (a) M = 0, (b) M = 0.5, (c) p = 0, or (d) p = 0.5 . Explain your choice.

Q. 5

Using the standard normal curve, the z-score representing the 75th percentile is 0.67.
  Indicate whether the statement is true or false

Q. 6

A quality control officer tests bottles of shampoo to see if the filling machines are putting the proper amount in each bottle. They do not want to shut down production unless there is strong evidence indicating that the machines are not functioning properly. After testing a sample of bottles, the quality control officer decides to leave the filling machines operating. Actually, however, the filling machines are not operating properly. Which type of error, if any, did the quality control officer commit?
 a. This is a Type I error.
  b. This is a Type II error.
  c. This is a Type O error.
  d. This is a correct decision.
  e. Need more information to answer this question.

Q. 7

Why does the sign test use a null hypothesis about the median instead of the mean like a t - test uses?

Q. 8

Using the standard normal curve, the z-score representing the 10th percentile is 1.28.
  Indicate whether the statement is true or false

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