Below is a density curve. The height of the density curve is

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Presentation transcript:

Below is a density curve. The height of the density curve is 1 2 1/2

The density curve below has a triangular distribution The density curve below has a triangular distribution. What is the value of h that makes this a true density curve? 2/3 3/2 1/2

Insufficient information The heights of women are normally distributed with a mean of 65 inches and an SD of 2.5 inches. The heights of men are also normal with a mean of 70 inches. What percent of women are taller than a man of average height? 2.5% 5% 10% Insufficient information

Many psychological disorders (e. g Many psychological disorders (e.g. Depression, ADHD) are based on the application of the 2 SD rule assuming a normal distribution of reported symptoms. This means that anyone who reports a symptom count that exceeds the 2 SD point in a normal population can be considered to be “abnormal” or “disordered”. Given this definition of “disorder”, what is expected prevalence rate of these disorders based on the 2 SD rule? 1% 2.5% 5% 10%

The University of Oklahoma has changed its admission standards to require an ACT-score of 26. We know the ACT is normally distributed with a mean of 21 and an SD of 5. If we sample 100 students who took the ACT at random, how many would be expected to qualify for admission to OU? 5 16 25 42 None of the above

The time for students to complete a standardized placement exam given to college freshman has a normal distribution with a mean of 62 minutes and a standard deviation of 8 minutes. If students are given one hour to complete the exam, the proportion of students who will complete the exam is about 0.25 0.40 0.60

Answers to slides C A B or C, depending upon the type of mental disorder B