The primary advantage of a stratified random sample is that it ____
a. ensures that group sizes will be adequate for statistical analysis
b. provides a sample that is guaranteed to be representative of the population
c. ensures that no single group is over-represented in the sample
d. does not require pre-existing knowledge about the population
a
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On which of the following personality traits has research found stability across the lifespan?
A. Virtually all dimensions of personality B. Extroversion and introversion C. Extroversion and introversion, as well as cooperativeness D. Cooperativeness and openness to new experiences
Vanessa and Jenny take a reaction-time test. Vanessa's reaction time is 0.23 seconds, and Jenny's reaction time is 0.25 seconds. Suppose that the stopwatch the psychologist used only measured to a tenth of a second. The psychologist concludes that Vanessa and Jenny have equal reaction times of 0.2 seconds. As a measure of reaction time, the stopwatch lacks:
A) reliability. B) validity. C) power. D) reactivity.
You are a psychologist who wants to explain each of the following problems or behaviors. Identify which of the three major theoretical perspectives examined in this chapter will be most useful to you in each case, and briefly explain why
a. Randy finds it difficult to stop smoking, especially when he is studying. b. Alec has an irrational fear of thunderstorms. c. Anne always misbehaves in the supermarket, but is perfectly well-behaved in the car. d. Debra thinks that girls can change into men when they grow up. e. Coco, a cocker spaniel, has learned to sniff out narcotics at the airport. What will be an ideal response
How is the null hypothesis of the independent samples t-test verbalized?
a. There is a relationship between the independent variable and the dependent variable. b. There is no relationship between the independent variable and the dependent variable. c. The difference between the sample means is equal to ยต. d. The independent variable has an effect on the dependent variable.