1) Given IQ scores are approximately normally distributed with a mean of 100 and standard  a) 95% b) 68% c) 5% d) 2.5% 2) Randomly assigning treatment to experimental units allows: a) population inference b) causal inference c) both types of inference d) neither type of inference 3) Failing to reject the null hypothesis when it is false is: a) alpha b) Type I error c) beta d) Type II error 4) A parameter is: a) a sample characteristic b) a population characteristic c) unknown d) normal normally distributed 5) A statistic is: a) a sample characteristic b) a population characteristic c) unknown d) normal normally distributed

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