In the formula for finding a confidence interval when the value of the population standard deviation is unknown, we change N to N-1. The reason for this change is
a. to correct for the fact that s is biased.
b. the standard deviation of a sample is always greater than the standard deviation of the population.
c. the standard deviation of a sample is unbiased.
d. sample size is much too large.
ANSWER: a
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It is recommended that a group leader avoid allowing a "hub and spoke" pattern from evolving during group discussion. What is the best way to keep such a pattern from developing?
a. Appoint another participant to lead the discussion b. Indicate that it is not your job to reply to each comment c. Respond to each comment and ask if others agree with you d. Ask participants to speak to the whole group and not just the leader
Approximately how many people in the 2010 U.S. census self-identified as more than one race?
a. 4 million b. 14 million c. 40 million d. 104 million
The highest concentration of high-income people is found ________
a. in small towns of the Midwest. b. near large metropolitan areas, especially on the East and West Coasts. c. in the Southwest. d. in the deep South.
The largest source of illegal income in the United States is cash wages paid to illegal immigrant laborers.
a. true b. false