In the simple experiment described by your text, extraneous variables were controlled using random assignment.
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Q16: To capture the size of the difference
Q17: The formula for power is 1
Q18: Both
Q19: Normally distributed populations with equal variances are
Q20: The null hypothesis states that the sample
Q22: The t test was developed as a
Q23: The two kinds of t tests described
Q24: The numerator of an independent-samples t test
Q25: Values of d greater than 1.00 indicate
Q26: A confidence interval about a mean difference
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