A school administrator finds no statistically significant difference in learning whether students ...

A school administrator finds no statistically significant difference in learning whether students are taught by computer or by books. She decides not to spend money on new computer equipment. Later, she finds that a neighboring district is very successful in implementing computer technology.
 
  a. She may have committed a Type I error.
  b. She may have committed a Type II error.
  c. A Type I and Type II error may have occurred.
  d. No error is possible in this situation.

Ques. 2

If a research study concludes that a new computer-based reading program teaches students how to read more quickly than the old method
 
  a. a Type I error could have occurred.
  c. both errors could have occurred.
  b. a Type II error could have occurred.
  d. neither error could have occurred.

Ques. 3

The null hypothesis states that
 
  a. the effect of the treatment is negative.
  b. the apparent relationship between variables is due to chance alone.
  c. outcomes are affected by the experimental treatment.
  d. the true relationship between variables can never be known.

Ques. 4

Do athletes who include imaging their success as part of their practice do better than athletes who do not include imaging? The null hypothesis is
 
  a. athletes who image do better than athletes who do not image.
  b. athletes who image do worse than athletes who do not image.
  c. athletes who image do not differ from athletes who do not image.
  d. the population mean of athletes who image is greater than the population mean of athletes who do not image.

Ques. 5

If a test has been found to be statistically significant at the .05 level, the probability of getting this result by chance alone is
 
  a. exactly 5 times out of 100.
  c. equal to or less than 5 times out of 100.
  b. equal to or more than 5 times out of 100.
  d. more than 5 times out of 1,000.

Ques. 6

If a research finding is found to be statistically significant it
 
  a. confirms the research hypothesis.
  b. suggests the findings are significant contributions to the theory being tested.
  c. suggests that similar results would be found if another sample was tested.
  d. All of these are true.

Ques. 7

The standard error of the mean
 
  a. estimates the standard deviation of the population.
  b. suggests how much sample means may vary due to treatment procedures.
  c. is the standard deviation of the distribution of sample means.
  d. All of these are true.

Ques. 8

The standard deviation of the population is ____ the standard error of the mean.
 
  a. equal to
  c. smaller than
  b. larger than
  d. not related to

Ques. 9

Sampling error will be less when
 
  a. the samples are small.
  c. the distribution is normal.
  b. the population is heterogeneous.
  d. none of these are true.

Ques. 10

After calculating the difference between sample means of all possible samples from a population and the population mean, we would expect the mean of these differences to be
 
  a. equal to the population mean.
  c. zero.
  b. higher or less than the population mean.
  d. None of these are true.

Ques. 11

Refer to Exhibit 7-2. Chooses subjects that seem to be typical of a defined subgroup.
 
  a.
  Convenience
  c.
  Quota
  b.
  Purposive

Ques. 12

Refer to Exhibit 7-2. Chooses subjects that seem to be typical of the population being studied.
 
  a.
  Convenience
  c.
  Quota
  b.
  Purposive