If an IQ distribution is normal and has a mean of 100 and a standard deviation...

If an IQ distribution is normal and has a mean of 100 and a standard deviation of 15, then 99% of all those taking the test scored between IQ's of

A. 0 and 150

B. 55 and 145

C. 92.5 and 107.5

Expert Solution

Now we want to find the interval at which 99% of all those the test score lies.

milcah answered 1 year ago

Some IQ tests are standardized to a Normal distribution with mean 100 and standard deviation 16....

Some IQ tests are standardized to a Normal distribution with mean 100 and standard deviation 16. (a) [5 points] What proportion of IQ scores is between 95 and 105? (b) [5 points] What is the 80th percentile of the IQ scores? (c) [5 points] A random sample of 10 candidates are about to take the test. What is the probability that at least half of them will score between 95 and 105? (d) [5 points] A random sample of 10...

12. A standard IQ test has a normal distribution with a mean of 100 with a...

12. A standard IQ test has a normal distribution with a mean of 100 with a standard deviation of 15. a) A score of 145 or higher on this exam is categorized in the gifted realm. What percent of people would be considered gifted? ___________ b) The people who score in the lowest 5% of the standard IQ test are considered to have “mental retardation”. What cutoff score is used to qualify for this benchmark? ___________

Problem 8 IQ scores have a normal distribution with mean µ = 100 and standard deviation...

Problem 8 IQ scores have a normal distribution with mean µ = 100 and standard deviation σ = 15. (A) Find the probability that the IQ score of a randomly selected person is smaller than 107. (B) Find the 95th percentile of IQ scores.

IQ scores in a large population have a normal distribution with mean=100 and standard deviation=15. What...

IQ scores in a large population have a normal distribution with mean=100 and standard deviation=15. What is the probability the sample mean for n=2 will be 121 or higher? (I understand the z score equals 1.98,could you please explain to me how the final answer is equal to 0.0239?thanks.) Also, why do we use 1 and subtract 0.9761 to get 0.0239? Where does 0.9761 come from?

1)In a distribution of IQ scores, where the mean is 100 and the standard deviation is...

1)In a distribution of IQ scores, where the mean is 100 and the standard deviation is 15........ -Compute the z score for an IQ of 100 -Compute the z score for an IQ of 107 2)For all US women, assuming a normal distribution - Mean height is 64 inches ; Standard deviation is 2.4 inches -What percentage of US women are 60 inches or shorter? -What percentage of US women have a height between 64 and 67 inches?

A population has a normal distribution with a mean of 51.4 and a standard deviation of...

A population has a normal distribution with a mean of 51.4 and a standard deviation of 8.4. Assuming n/N is less than or equal to 0.05, the probability, rounded to four decimal places, that the sample mean of a sample size of 18 elements selected from this population will be more than 51.15 is?

A population has a normal distribution with a mean of 51.5 and a standard deviation of...

A population has a normal distribution with a mean of 51.5 and a standard deviation of 9.6. Assuming , the probability, rounded to four decimal places, that the sample mean of a sample of size 23 elements selected from this populations will be more than 51.15 is:

Draw 100 numbers from a normal distribution with a mean of 7 and standard deviation of...

Draw 100 numbers from a normal distribution with a mean of **7** and standard deviation of **4**, and store the output in an object called "x1": (R STUDIO)

Now assume you have a normal distribution with a mean of 100 and standard deviation of...

Now assume you have a normal distribution with a mean of 100 and standard deviation of 15 that is composed of 2000 participants. Please answer the following questions, what is the probability of the following? (please with steps) a. A score being between 100 and 115 b. A score greater than 130 c. A score less than 70 d. A score either greater than 130 or less than 70 e. A score either greater the 100 or less than 85

#1. The Wechsler IQ test has a mean of 100 with a standard deviation of 15....

#1. The Wechsler IQ test has a mean of 100 with a standard deviation of 15. a) What percentage of the population has a W-IQ score below 110? b) What percentage of the population has a W-IQ score above 75? c) What percentage of the population has a W-IQ score between 80 and 120? d) What percentage of the population has a W-IQ score between 90 and 105?

Question