Prob & Stats Study Guide Test 2024.

Prob & Stats Study Guide Test 2024. You measure the age (years), weight (pounds), and marital status (single, married, divorced, or widowed) of 1400 women. How many variables did you measure? - CORRECT ANSWER D (Three) A company database contain the following information about each employee: age, date hired, sex (male or female), ethnic group (Asian, black, Hispanic, etc.), job category (clerical, management, technical, etc.), yearly salary. Which of the following lists of variables are all numerical? - CORRECT ANSWER D (Yearly salary, age) BLANK A should read: - CORRECT ANSWER B (Observational Studies) BLANK B should read: - CORRECT ANSWER D (Experiments) BLANK C should read: - CORRECT ANSWER D (Treatment) A local police department gives everyone who applies for a job a test in American history. However, experience shows that these test scores are unrelated to future job performance. As a measure of ability to do police work, the history test scores... - CORRECT ANSWER D (Are invalid) A measurement process that does not systematically overstate or understate the true value of the quantity being measured is called... - CORRECT ANSWER D (Unbiased) The same police department also gives job applicants a test of their knowledge of modern popular music. Experience shows that those who score well on this test tend to become lousy police officers. As a measure of future job performance, the music test scores... - CORRECT ANSWER E (Have predictive validity) Professor Iconu has developed a new college entrance test. Any such test must have several versions because some people take the test more than once. Unfortunately, it turns out that the same person often gets very different scores depending on which version of the test is offered. The test suffers from... - CORRECT ANSWER D (Low reliability) When I set my alarm clock to ring at 6:30, it rings 10 minutes late every day. My alarm clock is - CORRECT ANSWER A (Biased) The diameter of a metal rod was measured 8 times and the result in millimeters were: 31.7, 31.7, 31.8, 31.7, 31.8, 31.8, 31.7. The true diameter of the rod is 29.2 millimeters. The measurement process appears to... - CORRECT ANSWER B (Be reliable but somewhat biased) In an experiment to study the effect of vibrations on plant growth, the height of a chrysanthemum was measured three times. The reason for making the measurement three times instead of just once was probably to... - CORRECT ANSWER C (Increase reliability) A psychologist wants to know if adults with normal vision can be fooled by a certain optical illusion. She recruits 50 students from her PSY 120 class and finds that 42 of them are fooled by the illusion. The population in this study is... - CORRECT ANSWER D All adults with normal vision)