Question

7. In the general population, IQ scores have a mean of 100, a standard deviation of 15, and a normal distribution. a. If a person is randomly selected from the general population, what is the probability of getting a person with an IQ below 122? (Show as much work as possible. You can leave your answer with all 4 decimal places) b. What percentage of the general population has an IQ below 122? (You can leave your answer with 2 decimal places) c. Create a diagram 8. In the general population, IQ scores have a mean of 100, a standard deviation of 15, and a normal distribution. a. If a person is randomly selected from the general population, what is the probability of getting a person with an IQ below 95? (Show as much work as possible. You can leave your answer with all 4 decimal places) b. What percentage of the general population has an IQ below 95? (You can leave your answer with 2 decimal places) c. Create a diagram 9. In the general population, IQ scores have a mean of 100, a standard deviation of 15, and a normal distribution. a. If a person is randomly selected from the general population, what is the probability of getting a person with an IQ above 132? (Show as much work as possible. You can leave your answer with all 4 decimal places) b. What percentage of the general population has an IQ above 132? (You can leave your answer with 2 decimal places) c. Create a diagram 10. In the general population, IQ scores have a mean of 100, a standard deviation of 15, and a normal distribution. a. If a person is randomly selected from the general population, what is the probability of getting a person with an IQ between 113 and 127? (Show as much work as possible. You can leave your answer with all 4 decimal places) b. What percentage of the general population has an IQ between 113 and 127? (You can leave your answer with 2 decimal places) c. Create a diagram

Answer #1

7. IQ scores are normally distributed with a mean of 100 and a
standard deviation of 15 points.
a. Find the probability that a randomly selected person has an
IQ less than 115.
b. Find the probability that a randomly selected person has an
IQ above 60.
c. Find the 80th percentile for IQ scores.
d. Find the probability that 20 randomly selected person has an
IQ less than 110.
e. What percentage of people have IQ scores between 60...

IQ scores among the general population have a mean of
100
and a standard deviation of
15
. A researcher claims that the standard deviation,
σ
, of IQ scores for males is less than
15
. A random sample of
16
IQ scores for males had a mean of
98
and a standard deviation of
10
. Assuming that IQ scores for males are approximately normally
distributed, is there significant evidence (at the
0.1
level of significance) to conclude...

IQ scores are known to be normally distributed with a mean of
100 and a standard deviation of 16.
a. Determine the percentage of students who score between 85 and
120.
b. Determine the percentage of students who score 80 or
greater.
c. Obtain the quartiles, Q1, Q2, and Q3 for the IQ scores, and
show this on a sketch of a normal curve. Include both a z-axis and
an x-axis below the curve.
d. If Mensa only accepts the...

IQ scores are normally distributed
with mean of 100 and a standard deviation of 15.
If MENSA only accepts people with an IQ score at the
99th percentile or higher, what is the lowest possible
IQ score you can have and still be admitted to the
organization?
Mental disability has traditionally been diagnosed for anyone
with an IQ of 70 or lower. By this standard, what proportion of the
population would meet criteria to be diagnosed with a mental
disability?...

For the general population, IQ test scores are normally
distributed with a mean of 100 and a variance of 225.
The IQ scores for a sample of 81 randomly selected chemical
engineers resulted in a variance of 144.
We want to test the claim that the variance for chemical
engineers is less than that of the general population.
1. What is the Null Hypothesis and the Alternative
Hypothesis?
2. If we use a 0.01 significance level, what is the critical...

In the general population, IQ scores are approximately normally
distributed with a mean of 100 and a standard deviation of 15.
Lewis Terman developed the idea of IQ and proposed classifying
people with IQ scores over 140 as "genius".
1. What percent of the general population have IQ scores that
would be classified as genius?
2. Give a range of values that would include IQ scores for the
middle 75% of the general population.

For the following, consider that IQ scores are normally
distributed with a mean of 100 and a standard deviation of 15.
Find the probability that a person has an IQ below 60
Find the probability that a randomly selected person has an IQ
between 60 and 85
Find the probability that a randomly selected person has an IQ
above 118.
Find the IQ score that cuts off the lower 25% of the population
from the upper 75%.
Find the probability...

According to an article in American Scientist, IQ scores are
normally distributed with a mean of 100 and a standard deviation of
15. Find the following probabilities:
a) The probability that a randomly selected person has an IQ
score of at least 111.
b) The probability that a randomly selected person has an IQ of
less than 96.
c) The probability that a randomly selected person has an IQ
score between 119 and 145.
(Please show all work.)

adults have IQ scores that are normally distributed with a mean of
100 and a standard deviation of 15
a. what IQ score respresents the 95th percentile?
b. what IQ score represents the 50th percentile?
show how you got the answer step by step, clearly just trying
to check my work thanks !

A certain IQ test is known to have a population mean of 100 and
standard deviation of 15 in the general population. You want to
test whether psychology majors have a different average IQ than the
population as a whole. Assume the variance of IQ is the same for
Psych majors as it is in the general population.
Suppose that Psychology majors actually have an average IQ of
108. If you do a 2-tailed test at α= .05 with a...

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