4. The famous IQ test is designed to have a normal distribution, a population mean score...
A person must score in the upper 4% of the population on an IQ test to qualify for membership in Mensa, the international high IQ society, If IQ scores are normally distributed with a mean of 100 and a standard deviation of 15, what score must a person have to qualify for Mensa. Draw a diagram and show formula (2 decimals)
1. A survey of the income of 9 students was conducted and the results are shown in the table below. 21342 22356 28624 12455 15487 16489 14596 25624 52483 Compute the mean and median of the above data. 2. Find the five-number summary and construct a boxplot for the following data: 12, 31, 23, 8, 23, 11, 33, 17, 28, 23, 23, 16 3. World truck production (fictional) 1985 1986 1987 1988 Year x Trucks y (millions) 1984 15.9 16.3...
1. The typical IQ test is designed with a mean of 100 and standard deviation of 15. Find Z score corresponding to IQ score of 128 (4 points) Z= 1. The typical IQ test is designed with a mean of 100 and standard deviation of 15. Find Z score corresponding to IQ score of 128 (4 points) Z=
A person must score in the upper 2% of the population on an IQ test to qualify for membership in Mensa, the international high-IQ society. If IQ scores are normally distributed with a mean of 100 and a standard deviation of 10, what score must a person have to qualify for Mensa? Every day Cara runs for five miles. Suppose that the time it takes her to complete the run is a random variable that is normally distributed with a...
9. The Wechsler IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of normal adults. Listed below are IQ scores of randomly selected professional pilots. It is claimed that because professional pilots are a more homogeneous group than the general population. Use a 0.05 significance level to test the claim that pilots have IQ scores with a standard deviation less than 15. Do not use the p-value. 121 116 115...
Q3: The score of IQ has a normal distribution. Suppose the average IQ score is 110 and the standard deviation is 15. a. What is the IQ score that is 1.5 standard deviations higher than the average and what proportion of people exceed that score? b. A person is selected at random. What is the probability that his/her IQ score is between 95 and 140? 20.1587 = 1 and 20.0668 = 1.5 and 20.0228 = 2 and 20.0013 = 3
An IQ test is designed so that the mean is 100 and the standard deviation is 13 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 4 IQ points of the true mean. Assume that σ=13 and determine the required sample size using technology. Then determine if this is a reasonable sample size for...
Assume standard IQ test scores follow a normal distribution with a population standard deviation of 14 points. In estimating the mean score of a sample group, we want to be 98% certain that we are within 4 IQ points of the true mean. Determine the required sample size.
The standard IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of all adults. We wish to find the sample size necessary to estimate the mean IQ score of statistics students. Suppose we want to be 96% confident that our sample mean is within 1 IQ points of the true mean. The mean for this population is clearly greater than 100 . The standard deviation for this population is probably...
Stanford–Binet IQ Test scores are normally distributed with a mean score of 100 and a standard deviation of 15. (10 points) Sketch the distribution of Stanford–Binet IQ test scores. Write the equation that gives the z score corresponding to a Stanford–Binet IQ test score. Sketch the distribution of such z scores. Find the probability that a randomly selected person has an IQ test score Over 145. Under 91.