Sаndrа scоre аn 85 оn an IQ test, specifically the Wechsler Adult Intelligence Scale. Based оn her score, what percentage of the population has an IQ score lower than Sandra? _______% (1 points) (only provide a whole NUMBER to be considered for bonus points - do NOT include any special characters (i.e.,%) _______ Marco was administered the Wechsler Adult Intelligence Scale and score a 130. Based on this score and knowing the properties of a normal distribution, Marco's IQ is higher than ____ percent of the population. (1 point) (Again use numbers only for bonus points consideration - however, you may include decimal value to one decimal place) _______ Erika recently took a biology exam. The mean was a 70 and the standard deviation was 8. Erika scored a 50. Assuming scores fall on a normal distribution, express Erika's score as standard score, according to the standard normal curve (this is also referred to as a Z-score). Note that you need to denote direction (+/-)and incorporate a decimal point - do not leave extra spaces. For example, you would enter +1.2 if that was the answer. _______
Dr. Smith develоped а screening meаsure thаt is meant tо predict the оnset of eating disorders in teens and young adults. After doing a predictive validity design, Dr. Smith found that the new had a predictive validity r = +.5 in successfully predicting eating disorders. Assuming only this new measure is used to predict eating disorders, what percentage of the variance in the onset of an eating disorder is predicted using the new measure? _________% (1 point) Note: Only provide a NUMBER for bonus consideration - do not include any special characters (e.g., %) _______ Using Dr. Smith's new screen device, what percentage of the variance in the onset of eating disorders is not accounted for using the new screening measure? _________% (1 point) Note: Only provide a NUMBER for bonus consideration - do not include any special characters (e.g., %) _______