Question

- Consider the following IQ data obtained from a sample of 25
incarcerated youth. Convert the 25 raw adjustment scores to
standardized scores. Show work for at least one of the 25 scores.
(Hint: You need to calculate the mean and SD first!)
**(4pts for entire column)***For this question, only TWO decimal places are required.

ID: 1, 2, 3, 4, 5, 6 , 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25

IQ Score: 90, 95, 92, 98, 82, 109, 92, 99, 99, 107, 99, 97 88, 75, 115, 92, 95, 73, 89, 93, 90, 109, 105, 103, 86

**Use the probability density function for Part
2-4.**

Show your work.

**2.** What is the probability of obtaining a
standardized score less than or equal to 1.0 standard deviations
from the mean? **(2pts)**

P (z ≤ 1.0) =

**3.** What is the probability of obtaining a
standardized score that is between 0.5 and 2.0 standard deviations
from the mean? **(2pts)**

P (0.5 ≤ z ≤ 2.0) =

**Use the information from Part 1** to help answer
this question.

What is the probability of obtaining an assessment score between
85 and 95? **(2pts)**

P (85 ≤ x ≤ 95) =

Answer #1

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...

The population IQ score was collected from a national-wide test.
The mean population IQ score is 101 and with a stand deviation of
15. The data of original population follows the normal
distribution.
Use the Z-score table provided to answer the following
questions:
(1) What is the Z score for IQ score = 95?
Answer: (Please report your answer to 3 decimal
places.)
(2) What is the Z score for IQ score = 110?
Answer: (Please report your answer to 3 decimal...

Listed in the data table are IQ scores for a random sample of
subjects with medium lead levels in their blood. Also listed are
statistics from a study done of IQ scores for a random sample of
subjects with high lead levels. Assume that the two samples are
independent simple random samples selected from normally
distributed populations. Do not assume that the population standard
deviations are equal. Complete parts (a) and (b) below. Use a
0.10 significance level for both...

A graduate student obtains data from a sample of children with
ADHD. The data represent level of activity where higher scores
indicate more activity and are as follows:
32, 25, 38, 32, 31.
e) Find the z-score for child 1.
f) Find the z-score for child 3.
g) For child 4, find the standardized score with a
mean of 70 and SD of 10.
h) For child 3, find the standardized score with a
mean of 70 and SD of...

A graduate student obtains data from a sample of children with
ADHD. The data represent level of activity where higher scores
indicate more activity and are as follows:
31, 25, 38, 35, 31.
a) Find the median.
b) Find the mean.
c) Find the range.
d) Find the standard deviation.
e) Find the z-score for child 1.
f) Find the z-score for child 2.
g) For child 4, find the standardized score with a
mean of 55 and variance of...

A graduate student obtains data from a sample of children with
ADHD. The data represent level of activity where higher scores
indicate more activity and are as follows: 31, 25, 38, 32, 39. a)
Find the median. b) Find the mean. c) Find the range. d) Find the
standard deviation. e) Find the z-score for child 3. f) Find the
z-score for child 4. g) For child 2, find the standardized score
with a mean of 62 and SD of...

The human resources department of an engineering company gives
IQ tests to a randomly selected group of new hires every year. They
claimed that the mean IQ score of new hires, μ1 , from this year is
greater than or equal to the mean IQ score of new hires, μ2 , from
last year. This year, 90 new hires took the test and scored an
average of 113.1 points with a standard deviation of 14.3 . Last
year, 85 new...

The following data represents the exam scores of students in
Econ 220 VV22, which is one of several sections of Econ 220 in a
college. You can take this as a sample.
Student
Score
1
82
2
70
3
50
4
60
5
75
6
65
7
55
8
80
9
85
10
90
11
95
12
94
13
35
14
40
15
65
16
95
17
91
18
55
19
65
20
76
21
86
22
96...

Given Data:
(1)= low lead level (2)= medium lead level, (3)= high lead
level
IQ: 85 (1), 94 (1), 97 (1), 86 (1), 86 (1), 107 (1), 91 (1), 99
(1), 115 (1), 50 (1), 93 (1), 98 (1), 100 (1), 94 (1), 73 (1), 76
(1), 72 (1), 76 (1), 95 (1), 89 (1), 96 (1), 108 (1), 74 (1), 72
(2), 90 (2), 100 (2), 91 (2), 98 (2), 91 (2), 85 (2), 97 (2), 91
(2), 78...

Question 9-15 are based on the random
sample below which is obtained to test the following hypothesis
about the population mean. Test the hypothesis that the mean is
less than 80.
80
100
81
93
80
57
98
90
71
56
58
78
59
55
55
77
72
78
56
94
98
59
93
86
89
62
60
66
59
71
96
97
94
69
64
77
87
77
64
90
90
95
98
99
56
69
72
81
95...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 6 minutes ago

asked 9 minutes ago

asked 18 minutes ago

asked 30 minutes ago

asked 34 minutes ago

asked 36 minutes ago

asked 41 minutes ago

asked 48 minutes ago

asked 56 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago