A professor of women's studies is interested in determining if stress affects the menstrual cycle. Ten women are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to high stress for two months while the other lives in a relatively stress-free environment. The professor measures the menstrual cycle (in days) of each woman during the second
month. The following data are obtained. High stress 20 23 18 19 22 Relatively stress free 26 31 25 26 30 Assume you are evaluating H0 using the t test. The df for determining tcrit are _________.
a. 4 c. 8
b. 9 d. 3
C
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Gavin finds that he remembers the material in his textbooks much better when he studies for 30 minutes each night on the 6 nights before an exam, than when he studies for 3 hours straight through on the night before an exam. Gavin's experience is consistent with memory research that has documented the effectiveness of the technique known as:
a. massed practice b. distributed practice c. chunking d. elaborative encoding
Neurocysticercosis results from an infection by a. a fungus
b. the larvae of the pork tapeworm. c. a type of bacteria. d. a virus.
Children of physically active fathers are _____ times as likely to be active as children of inactive fathers
Fill in the blank(s) with correct word
In a study that followed a sample of women diverse in SES throughout adulthood, __________ predicted ego integrity in late adulthood
A) college graduation B) midlife generativity C) early retirement D) adolescent identity foreclosure