15. IQ scores form a normal distribution with a = 100 and o = 15. Individuals...
1. The IQs of individuals form a normal distribution with mean = 100 and s = 15. A. What percentage of the population have IQs below 85? B. What percentage have IQs over 130? C. A college requires an IQ of 120 or more for entrance. From what percentage of the population must it draw its students? D. In a state with 400,000 high school seniors, how many meet the IQ requirement?
On IQ distribution (normal) , with a mean of 100 and a standard deviation of 15 , find the actual IQs (raw scores) for individuals with the following z scores. 1) .60 2) 2.60 3) -1.80 4) -.20 5) 2.80
What proportion of a normal distribution is located between each of the following Z-score boundaries? a. z= -0.50 and z= +0.50 b. z=-0.90 and z= +0.90 c. z=-1.50 and z= 1.50 For a normal distribution with a mean of μ = 80 and a standard deviation of σ= 20, find the proportion of the population corresponding to each of the following. a. Scores greater than 85. b. Scores less than 100. c. Scores between 70 and 90. IQ test scores are standardized to produce a normal distribution with...
(1 point) The distribution of IQ scores can be modeled by a normal distribution with mean 100 and standard deviation 15. (a) Let x be a person's IQ score. Write the formula for the density function of IQ scores. p(x) = (b) Estimate the fraction of the population with IQ between 80 and 85. fraction =
The population of IQ scores forms a normal distribution with mu equals space 100 and sigma space equals space 15. If you take a random sample of 25 people who have taken the IQ test, what is the probability of obtaining a sample mean greater than M = 103? p = 0.8413 p = 0.5793 p = 0.4207 p = 0.1578
The Wechsler Adult Intelligence Scale (WAIS) intelligence quotient (IQ) tests are the primary clinical instruments used to measure adult and adolescent intelligence (16-89 years old). The distribution of IQ supposedly follows a normal distribution curve with mean 100 and standard deviation 15. IQ scores between 70 and 130 run the gamut from "borderline" intelligence to very superior intelligence. Using the empirical rule, what is the probability a randomly chosen adult has an IQ score between 70 and 130? 0.95 0.68...
#3 One of the most common ways of measuring intelligence is the IQ test. IQ scores in the US population have an average of µ = 100 and a standard deviation of σ = 15. Suppose a researcher wanted to test whether socioeconomic status (SES) has an effect on IQ scores. The researcher takes a random sample of n = 100 people, selected from a list of the 1000 richest people in the United States. a. Based on this information,...
IQ-scores are standard-score transformed scores having a mean of 100 and a standard deviation of 15; SAT scores are standard-score transformed scores having a mean of 500 and a standard deviation of 100. In what follows, X refers to a raw score from a distribution with a mean of X and a standard deviation of S, and SAT and IQ refer to the corresponding transform of that score. Solve for the missing value in each of the following: (a) X=-2.5;Xmean=...
The IQ scores for adults in the entire population have an approximate normal distribution with mean 100 and standard deviation 15. A study done on 200 college students (ages 20 to 25) found college student age 20 to 25 have an average IQ of 105. Do college students aged 20 to 25 years old have a higher mean IQ than the rest of the population? Even if this does have statistical significance (meaning it is actually true), do you think...
Assume that IQ scores follow a Normal distribution with µ=100 and σ=16. Using our IQR rule for determining IQ score outliers, what IQ scores would establish the lower and upper fences for determining outliers?