True or False: As the level of confidence increases the number of item to be included in a sample will decrease when the error and the standard deviation are held constant.
A) False B) True
Question 2
A medical journal published the results of an experiment on insomnia. The experiment investigated the effects of a controversial new therapy for insomnia.
Researchers measured the insomnia levels of 40 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the womens insomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. What type of experimental design is this? A) matched-pairs design B) completely randomized design
C) randomized block design D) single-blind design
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