Homework Answers
Using Excel , The following is the results obtained
Ho: u1 - u2 = 0
Ha: u1 - u2 not = 0
a)
| Boys | Girls | |
| Mean | 110.9574468 | 105.8387097 |
b)
| t Stat | 1.643877384 |
| P(T<=t) two-tail | 0.105706687 |
c) As p-value is less than 0.05 so we fail to reject the null hypothesis at 5% level of significance.
which denote that the mean IQ for both the boys and girls in 7th grade is equal
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Boys 111 107 100 The data to the left are IQ test scores for 47 seventh...
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114...
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 These 31 girls are an SRS of all seventh-grade girls in the school district. Suppose that the standard deviation of IQ scores in this population is known to be σ σ = 15. We...
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103...
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 These 31 girls are an SRS of all seventh-grade girls in the school district. Suppose that the standard deviation of IQ scores in this population is known to be σ = 15. We expect...
In a study to compare the IQ between boys and girls in a particular elementary school,...
In a study to compare the IQ between boys and girls in a particular elementary school, a random sample of seventh grade boys and girls was taken from Vancouver Hill Elementary School. The girls and boys were asked to take an IQ test and their scores were recorded. Some summary statistics of the IQs of the boys and girls is given below. Gender Number of children measured Average IQ Standard deviations of IQ Boys 17 107.1 5.6 Girls 15 105.5...
. We have IQ test scores of 31 seventh-grade girls in a Midwest school district. We...
. We have IQ test scores of 31 seventh-grade girls in a Midwest school district. We have calculated that sample mean is 105.84 and the standard deviation is 14.27. a. Give a 99% confidence interval for the average score in the population. What is the margin of error?
1.40 Describe the IQ scores. Make a graph of the distribution of IQ scores for the...
1.40 Describe the IQ scores. Make a graph of the distribution of IQ scores for the seventh-grade students in Table 1.3. Describe the shape, center, and spread of the 26 Chapter 1 Looking at Data-Distributions TABLE 1.3 Educational Data for 78 Seventh-Grade Sltudents Educational Data for 78 Seventh-Grade Students OBS GPA 1O Gender concept I0 Genderconcept 7.940 8.292 4.643 7.470 8.882 7.585 7.650 2.412 6.000 10.760 9.763 003 9410 126 9.167 9.348 127 047 51 8.167 3.647 3.408 3.936 119...
82 96 99 102 103 103 106 107 108 108 108 108 109 110 110 111...
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-- g a wversity mo school a. Calcualte a point estimate of the mean value of IQ for the population of first graders at this school What estimator did you use? b. Calculate a point estimate of the IW value that separates the lowert 50% of all...
The data below comes from a university that wanted to see if there was a relationship between IQ ...
The data below comes from a university that wanted to see if
there was a relationship between IQ scores and the GPA’s of
students after their freshman year. Please provide the claim,
critical values, test statistic and conclusion. If answered
correctly will leave a like.
GPA 3.68 3.10 2.72 3.61 4.0 3.89 3.51 2.64 3.33 3.32 2.91 3.81 3.53 3.95 3.57 3.22 IQ 126 105 104 118 126 154 118 98 108 108 95 113 128 134 116 103 119...
A stemplot of the IQ test scores from 78 seventh-grade students in a rural midwestern school...
A stemplot of the IQ test scores from 78 seventh-grade students in a rural midwestern school is provided. 7/24 7 79 8 69 90133 96778 10 0 0 2 2 3 3 3 3 4 4 10 5 5 5 6 6 6 777789 11000011112 2 2 2 3 3 3 4 4 4 4 11 55688999 1200 3 3 44 126 77888 1302 136 (Key: 712 = 72) (a) Four students had low scores that might be considered outliers....
(3.46) Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district:...
(3.46) Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 14 100 104 89 102 91 114 114 103 105 108 130 120 132 1 128 18 119 8672 1 103 74 112 107 103 9896 112 112 93 Data Set eBook Step 1 We expect IQ scores to be approximately Normal Make a stemplot to check that there are no major departures from Normality. Use stems with units of tenths. Match your results...
Human measurements provide a rich area of application for statistical methods. The article "A Longitudinal Study...
Human measurements provide a rich area of application for statistical methods. The article "A Longitudinal Study of the Development of Elementary School Children's Private Speech" reported on a study of children talking to themselves (private speech). It was thought that private speech would be related to IQ, because IQ is supposed to measure mental maturity, and it was known that private speech decreases as students progress through the primary grades. The study included 33 students whose first-grade IQ scores are...
1.40 Describe the IQ scores. Make a graph of the distribution of IQ scores for the seventh-grade students in Table 1.3. Describe the shape, center, and spread of the 26 Chapter 1 Looking at Data-Distributions TABLE 1.3 Educational Data for 78 Seventh-Grade Sltudents Educational Data for 78 Seventh-Grade Students OBS GPA 1O Gender concept I0 Genderconcept 7.940 8.292 4.643 7.470 8.882 7.585 7.650 2.412 6.000 10.760 9.763 003 9410 126 9.167 9.348 127 047 51 8.167 3.647 3.408 3.936 119...
82
96
99
102
103
103
106
107
108
108
108
108
109
110
110
111
113
113
113
113
115
115
118
118
119
121
122
122
127
132
136
140
146
-- g a wversity mo school a. Calcualte a point estimate of the mean value of IQ for the population of first graders at this school What estimator did you use? b. Calculate a point estimate of the IW value that separates the lowert 50% of all...
The data below comes from a university that wanted to see if
there was a relationship between IQ scores and the GPA’s of
students after their freshman year. Please provide the claim,
critical values, test statistic and conclusion. If answered
correctly will leave a like.
GPA 3.68 3.10 2.72 3.61 4.0 3.89 3.51 2.64 3.33 3.32 2.91 3.81 3.53 3.95 3.57 3.22 IQ 126 105 104 118 126 154 118 98 108 108 95 113 128 134 116 103 119...
A stemplot of the IQ test scores from 78 seventh-grade students in a rural midwestern school is provided. 7/24 7 79 8 69 90133 96778 10 0 0 2 2 3 3 3 3 4 4 10 5 5 5 6 6 6 777789 11000011112 2 2 2 3 3 3 4 4 4 4 11 55688999 1200 3 3 44 126 77888 1302 136 (Key: 712 = 72) (a) Four students had low scores that might be considered outliers....
(3.46) Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 14 100 104 89 102 91 114 114 103 105 108 130 120 132 1 128 18 119 8672 1 103 74 112 107 103 9896 112 112 93 Data Set eBook Step 1 We expect IQ scores to be approximately Normal Make a stemplot to check that there are no major departures from Normality. Use stems with units of tenths. Match your results...
Human measurements provide a rich area of application for statistical methods. The article "A Longitudinal Study of the Development of Elementary School Children's Private Speech" reported on a study of children talking to themselves (private speech). It was thought that private speech would be related to IQ, because IQ is supposed to measure mental maturity, and it was known that private speech decreases as students progress through the primary grades. The study included 33 students whose first-grade IQ scores are...
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