The number of degrees of freedom associated with the t-test, when the data are gathered from a ...

The number of degrees of freedom associated with the t-test, when the data are gathered from a matched pairs experiment with 10 pairs, is:
 a. 10
  b. 20
  c. 9
  d. 18
  e. 14

Q. 2

The dean of admissions in a large university has determined that the scores of the freshman class in a mathematics test are normally distributed with a mean of 82 and a standard deviation of 8 . Based on this information, what is the mean of the sampling distribution of the sample mean x if a sample of 64 students is selected at random from the entire freshman class?
 a. between 74 and 90
  b. between 78 and 86
  c. 64
  d. 70
  e. 82

Q. 3

If some natural relationship exists between each pair of observations that provides a logical reason to compare the first observation of sample 1 with the first observation of sample 2, the second observation of sample 1 with the second observation of sample 2, and so on, the samples are referred to as:
 a. matched samples
  b. independent samples
  c. weighted samples
  d. random samples
  e. natural samples

Q. 4

If the monthly rent of all one-bedroom apartments in a small town are known to be normally distributed with a mean equal to 175 a month and standard deviation of 35, which of the following would be the highest individual rent that you might expect to find?
 a. about 195
  b. about 210
  c. about 245
  d. about 280
  e. More information is needed to answer the question.

Q. 5

If you wish to test the difference between the means of two-paired populations with samples of size 15 each, then the appropriate degrees of freedom is equal to:
 a. 29
  b. 28
  c. 15
  d. 14
  e. 12

Q. 6

A numerical descriptive measure calculated from the entire population is called:
 a. a parameter
  b. a statistic
  c. a sample
  d. a sampling distribution
  e. an estimator

Q. 7

The paired-difference t-test for the main difference between two populations assumes:
 a. that the populations are approximately normally distributed
  b. that the sample variances are equal
  c. that the sample means are equal
  d. all of these
  e. none of these

Q. 8

A numerical descriptive measure calculated from the sample is called:
 a. a parameter
  b. a statistic
  c. a population
  d. a sampling distribution
  e. an estimator