Homework Answers
Here we have accepted a false null hypothesis (H0) .
Type two error is accepring H0 when it is false.
This is a case of type 2 error.
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q17 type 1 or type 2
IQ: Scores on a certain IQ test are known to...
Week 5 Questions 9.1 30. IQ: Scores on a certain IQ test are known to have...
Week 5 Questions 9.1 30. IQ: Scores on a certain IQ test are known to have a mean of 100. A random sample of 60 students attend a series of coaching classes before taking the test. Let μ be the population mean IQ score that would occur if every student took the coaching classes. The classes are successful if μ > 100. A test is made of the hypotheses H0: μ = 100 versus H1: μ > 100. Consider three...
IQ scores on a certain IQ test are known to have a mean of 100 and...
IQ scores on a certain IQ test are known to have a mean of 100 and a random sample of 60 students attend a series of coaching classes before taking the test let μ be the population mean IQ score that would occur if every student took the coaching classes. the classes are successful if μ is greater than 100. a test is made of the hypothesis Ho: μ explain=100 vs. H1: μ= > 100. Consider three possible conclusions number...
Ten randomly selected people took an IQ test A, and next day they took a very similar IQ test B. Their scores are shown...
Ten randomly selected people took an IQ test A, and next day
they took a very similar IQ test B. Their scores are shown in the
table below. For the difference use Test A - Test B. Use at least 4
decimal places.
Person
A
B
C
D
E
F
G
H
I
J
Test A
121
90
96
71
100
115
107
111
83
102
Test B
122
95
95
72
99
111
113
110
86
102
1. Use...
I have A. But cant figure out B OR C? Scores of an IQ test have...
I have A. But cant figure out B OR C?
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 12. Use the empirical rule to determine the following. (a) What percentage of people has an IQ score between 76 and 1247 (b) What percentage of people has an IQ score less than 64 or greater than 136? (c) What percentage of people has an IQ score greater than 136? (a)...
#3 One of the most common ways of measuring intelligence is the IQ test. IQ scores...
#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,...
Two statistics professors at two rival schools decide to use IQ scores as a measure of...
Two statistics professors at two rival schools decide to use IQ scores as a measure of how smart the students at their respective schools are. IQ scores are known to be Normally distributed. The two professors will use this knowledge to their advantage. They will randomly select 10 students from their respective schools and determine the students' IQ scores by means of the standard IQ test. The two professors will use the pooled version of the two-sample t test to...
Question Help Scores of an IQ test have a bell-shaped distribution with a mean of 100...
Question Help Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 13. Use the empirical rule to determine the following. (a) What percentage of people has an IQ score between 61 and 139? (b) What percentage of people has an IQ score less than 74 or greater than 126? (c) What percentage of people has an IQ score greater than 1262 (a) % (Type an integer or a decimal) Enter...
Boys 111 107 100 The data to the left are IQ test scores for 47 seventh...
Boys 111 107 100 The data to the left are IQ test scores for 47 seventh grade boys and 31 seventh grade girls from a Midwestern school district. 107 115 111 104 106 Do a test of hypothesis to see whether the mean test scores of the two groups are the same or different. Assume that the data represent a random sample from the population of 7th grade boys and girls from this school district. 113 109 113 128 128...
(2 points) Ten randomly selected people took an IQ test A, and next day they took...
(2 points) Ten randomly selected people took an IQ test A, and next day they took a very similar IQ test B. Their scores are shown in the table below. Person A B C D E F G H Test A 94 130 71 119 91 101 85 96 112 107 Test B 96 130 69 121 93 104 84 100 111 105 1. Consider (Test A - Test B). Use a 0.05 significance level to test the claim that...
(1 point) Ten randomly selected people took an IQ test A, and next day they took...
(1 point) Ten randomly selected people took an IQ test A, and next day they took a very similar IQ test B. Their scores are shown in the table below. Person! A | B | C | D |EFGH | 1 . J Test A 111 122 107 101 89 73 83 11793 100 Test B 116 124 110 10394 7382 11493 100 1. Use a 0.05 significance level to test the claim that people do better on the second...
Ten randomly selected people took an IQ test A, and next day
they took a very similar IQ test B. Their scores are shown in the
table below. For the difference use Test A - Test B. Use at least 4
decimal places.
Person
A
B
C
D
E
F
G
H
I
J
Test A
121
90
96
71
100
115
107
111
83
102
Test B
122
95
95
72
99
111
113
110
86
102
1. Use...
I have A. But cant figure out B OR C?
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 12. Use the empirical rule to determine the following. (a) What percentage of people has an IQ score between 76 and 1247 (b) What percentage of people has an IQ score less than 64 or greater than 136? (c) What percentage of people has an IQ score greater than 136? (a)...
Two statistics professors at two rival schools decide to use IQ scores as a measure of how smart the students at their respective schools are. IQ scores are known to be Normally distributed. The two professors will use this knowledge to their advantage. They will randomly select 10 students from their respective schools and determine the students' IQ scores by means of the standard IQ test. The two professors will use the pooled version of the two-sample t test to...
Question Help Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 13. Use the empirical rule to determine the following. (a) What percentage of people has an IQ score between 61 and 139? (b) What percentage of people has an IQ score less than 74 or greater than 126? (c) What percentage of people has an IQ score greater than 1262 (a) % (Type an integer or a decimal) Enter...
Boys 111 107 100 The data to the left are IQ test scores for 47 seventh grade boys and 31 seventh grade girls from a Midwestern school district. 107 115 111 104 106 Do a test of hypothesis to see whether the mean test scores of the two groups are the same or different. Assume that the data represent a random sample from the population of 7th grade boys and girls from this school district. 113 109 113 128 128...
(2 points) Ten randomly selected people took an IQ test A, and next day they took a very similar IQ test B. Their scores are shown in the table below. Person A B C D E F G H Test A 94 130 71 119 91 101 85 96 112 107 Test B 96 130 69 121 93 104 84 100 111 105 1. Consider (Test A - Test B). Use a 0.05 significance level to test the claim that...
(1 point) Ten randomly selected people took an IQ test A, and next day they took a very similar IQ test B. Their scores are shown in the table below. Person! A | B | C | D |EFGH | 1 . J Test A 111 122 107 101 89 73 83 11793 100 Test B 116 124 110 10394 7382 11493 100 1. Use a 0.05 significance level to test the claim that people do better on the second...
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