A child loves it when the piano tuner comes. His tuning forks have such a clear sound. The child doesn't know it, but that is because a tuning fork produces a pure tone which has
a. multiple sine waves.
b. a single sine wave.
c. one frequency and many amplitudes.
d. all possible frequencies.
Answer: b. a single sine wave.
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Professor Warren calculated the mean, median, and mode of the scores made on the midterm exam. These descriptive statistics are known as
a. inferential statistics. b. measures of central tendency. c. measures of variability. d. graphical statistics.
An independent variable is also referred to as a
a. level b. condition c. factor d. treatment
Which question could be answered best by using the survey method?
a) What is the effect of ingesting alcohol on problem-solving ability? b) Does wall color affect the frequency of violence in prison populations? c) Do students prefer a grading system with or without pluses and minuses? d) What is the relationship between the number of hours worked and grade-point average?
The umbilical cord contains
A) two veins and one artery. B) two arteries and one vein. C) two veins and two arteries. D) one vein and three arteries.