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. a. Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels. OA. Ho: H₁ H₂ H₁: H₁ H₂ OC. Ho: H₁ H₂ H₁: Hy > H₂ The test statistic is The P-value is (Round to two decimal places as needed.) (Round to three decimal places as needed.) ~ State the conclusion for the test. OB. Ho: H₁ = H₂ H₁: H₁ H₂ OD. Ho: H₁ H₂ H₁: Hy > H₂ IQ Scores Medium Lead Level High Lead Level 72 n₂ = 11 96 92 X₂ = 90.172 85 86 $210.173 97 83 92 102 111 91
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. a. Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels. OA. Ho: H₁ H₂ H₁: H₁ H₂ OC. Ho: H₁ H₂ H₁: Hy > H₂ The test statistic is The P-value is (Round to two decimal places as needed.) (Round to three decimal places as needed.) ~ State the conclusion for the test. OB. Ho: H₁ = H₂ H₁: H₁ H₂ OD. Ho: H₁ H₂ H₁: Hy > H₂ IQ Scores Medium Lead Level High Lead Level 72 n₂ = 11 96 92 X₂ = 90.172 85 86 $210.173 97 83 92 102 111 91
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
![State the conclusion for the test.
O A. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
O B. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
O C. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
O D. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
b. Construct a confidence interval suitable for testing the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.
<H1-H₂<
(Round to two decimal places as needed.)
Does the confidence interval support the conclusion of the test?
because the confidence interval contains
▼](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6e5ba9e2-fa50-4379-82c7-40e4cdb6753c%2Fb4494556-7ed4-4481-a9d1-dfd6e8f520e2%2Fk16mwi8_processed.png&w=3840&q=75)
Transcribed Image Text:State the conclusion for the test.
O A. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
O B. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
O C. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
O D. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores.
b. Construct a confidence interval suitable for testing the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.
<H1-H₂<
(Round to two decimal places as needed.)
Does the confidence interval support the conclusion of the test?
because the confidence interval contains
▼
![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.
a. Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.
What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels.
OA. Ho: H₁ H₂
H₁: Hy > H₂
OC. Ho: H₁ H₂
H₁: Hy > H₂
The test statistic is
The P-value is
(Round to two decimal places as needed.)
(Round to three decimal places as needed.)
C
State the conclusion for the test.
B. Ho: ₁₂
H₁: Hy #H₂
OD. Ho: H₁ H₂
H₁: H₁ H₂
IQ Scores
Medium Lead Level High Lead Level
72
n₂ = 11
96
92
X₂ = 90.172
85
86
S₂ = 10.173
97
83
92
102
111
91](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6e5ba9e2-fa50-4379-82c7-40e4cdb6753c%2Fb4494556-7ed4-4481-a9d1-dfd6e8f520e2%2Fa1y6zwh_processed.png&w=3840&q=75)
Transcribed Image Text: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.
a. Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels.
What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels.
OA. Ho: H₁ H₂
H₁: Hy > H₂
OC. Ho: H₁ H₂
H₁: Hy > H₂
The test statistic is
The P-value is
(Round to two decimal places as needed.)
(Round to three decimal places as needed.)
C
State the conclusion for the test.
B. Ho: ₁₂
H₁: Hy #H₂
OD. Ho: H₁ H₂
H₁: H₁ H₂
IQ Scores
Medium Lead Level High Lead Level
72
n₂ = 11
96
92
X₂ = 90.172
85
86
S₂ = 10.173
97
83
92
102
111
91
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