When estimating the variance of a population from the sample, the sample variance cannot be used directly because
A) it is based on using absolute deviations.
B) it is based on using squared deviations.
C) it tends to be slightly too large—it overestimates the population variance.
D) it tends to be slightly too small—it underestimates the population variance.
D
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Sally loves to run, and works jogging into her daily schedule because of the “runner’s high” she experiences. Sally is motivated by a(n) ____ reward
a. ?top-down b. ?bottom-up c. ?extrinsic d. ?intrinsic
When participants in one treatment condition have characteristics that are different from the characteristics of participants in another treatment condition, then ____ may be threatened
a. internal validity b. external validity c. reliability d. accuracy
Which of the following is a significant barrier to organ and tissue donation
a. potential donors who authorize donation by signing the form on the back of their stateauto driver's license b. the dominant U.S. policy of "presumed consent" c. legal obstacles within the American death system d. lack of discussion among family members about one's wishes e. problems with determination of death
Yu is terminally ill. He says, “I was not ready to live until I was ready to die. This life is a lot better than the one before.” Yu regards dying as __________
A) imprisonment B) part of life’s journey C) an experience to be transformed D) a mandate to live more fully