A random sample of 164 recent donations at a certain blood bank reveals that 89 were type A blood. Does this suggest that the actual percentage of type A donations differs from 40%, the percentage of the population having type A blood? Carry out a test of the appropriate hypotheses using a significance level of 0.01.
A random sample of 164 recent donations at a certain blood bank reveals that 89 were type A blood. Does this suggest that the actual percentage of type A donations differs from 40%, the percentage of the population having type A blood? Carry out a test of the appropriate hypotheses using a significance level of 0.01.
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
Q6
![**Hypothesis Testing for Proportion**
**State the appropriate null and alternative hypotheses.**
- \( H_0: p = 0.40 \)
\( H_a: p < 0.40 \)
- \( H_0: p = 0.40 \)
\( H_a: p > 0.40 \)
- \( H_0: p = 0.40 \)
\( H_a: p \neq 0.40 \)
**Calculate the test statistic and determine the P-value.**
(Round your test statistic to two decimal places and your P-value to four decimal places.)
\( z = \_\_\_\_\_\_ \)
\( P\text{-value} = \_\_\_\_\_\_ \)
**State the conclusion in the problem context.**
- Do not reject the null hypothesis. There is not sufficient evidence to conclude that the percentage of type A donations differs from 40%.
- Reject the null hypothesis. There is not sufficient evidence to conclude that the percentage of type A donations differs from 40%.
- Reject the null hypothesis. There is sufficient evidence to conclude that the percentage of type A donations differs from 40%.
- Do not reject the null hypothesis. There is sufficient evidence to conclude that the percentage of type A donations differs from 40%.
**Would your conclusion have been different if a significance level of 0.05 had been used?**
- Yes
- No
**Explanation of Graphs/Diagrams:**
There are no graphs or diagrams included in this document.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbdd9398b-9a89-4097-8d89-380633fcbf86%2F8a646e5a-4470-4e2b-a53c-017507d8731a%2F0173d7_processed.png&w=3840&q=75)
Transcribed Image Text:**Hypothesis Testing for Proportion**
**State the appropriate null and alternative hypotheses.**
- \( H_0: p = 0.40 \)
\( H_a: p < 0.40 \)
- \( H_0: p = 0.40 \)
\( H_a: p > 0.40 \)
- \( H_0: p = 0.40 \)
\( H_a: p \neq 0.40 \)
**Calculate the test statistic and determine the P-value.**
(Round your test statistic to two decimal places and your P-value to four decimal places.)
\( z = \_\_\_\_\_\_ \)
\( P\text{-value} = \_\_\_\_\_\_ \)
**State the conclusion in the problem context.**
- Do not reject the null hypothesis. There is not sufficient evidence to conclude that the percentage of type A donations differs from 40%.
- Reject the null hypothesis. There is not sufficient evidence to conclude that the percentage of type A donations differs from 40%.
- Reject the null hypothesis. There is sufficient evidence to conclude that the percentage of type A donations differs from 40%.
- Do not reject the null hypothesis. There is sufficient evidence to conclude that the percentage of type A donations differs from 40%.
**Would your conclusion have been different if a significance level of 0.05 had been used?**
- Yes
- No
**Explanation of Graphs/Diagrams:**
There are no graphs or diagrams included in this document.
![### Statistical Analysis of Blood Types in Donations
In a recent study, a random sample of 164 blood donations was analyzed to determine the distribution of blood types. The findings revealed that 89 of these donations were type A blood. This raises the question: Does the actual percentage of type A blood donations differ from the known population percentage of 40% for type A blood?
To answer this question, we will carry out a hypothesis testing procedure using a significance level of 0.01. The hypothesis test will determine if there is a statistically significant difference between the observed proportion of type A blood donations in our sample and the expected proportion in the general population (40%).
#### Hypothesis Testing Procedure
1. **Null Hypothesis (\(H_0\))**: The actual percentage of type A blood donations is 40%.
\[ H_0: p = 0.40 \]
2. **Alternative Hypothesis (\(H_A\))**: The actual percentage of type A blood donations is not 40%.
\[ H_A: p \neq 0.40 \]
3. **Significance Level (\(\alpha\))**: 0.01
4. **Sample Data**:
- Sample Size (\(n\)): 164
- Number of Type A Blood Donations (\(X\)): 89
5. **Sample Proportion (\(\hat{p}\))** of Type A Blood:
\[ \hat{p} = \frac{X}{n} = \frac{89}{164} \]
6. **Standard Error (SE)**:
\[ SE = \sqrt{\frac{p(1-p)}{n}} \]
7. **Test Statistic** (Z-score):
\[ Z = \frac{\hat{p} - p}{SE} \]
8. **Decision Rule**: Compare the Z-score to critical values from the Z-distribution for a two-tailed test at \(\alpha = 0.01\).
This analysis will help determine if the observed proportion of type A blood donations in the sample significantly deviates from the expected 40%, thus providing insights into the blood donation patterns at this blood bank.
---
By conducting this hypothesis test, we can draw conclusions about the blood donation trends and potentially inform strategies for managing blood donation stocks.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbdd9398b-9a89-4097-8d89-380633fcbf86%2F8a646e5a-4470-4e2b-a53c-017507d8731a%2F78dndp_processed.png&w=3840&q=75)
Transcribed Image Text:### Statistical Analysis of Blood Types in Donations
In a recent study, a random sample of 164 blood donations was analyzed to determine the distribution of blood types. The findings revealed that 89 of these donations were type A blood. This raises the question: Does the actual percentage of type A blood donations differ from the known population percentage of 40% for type A blood?
To answer this question, we will carry out a hypothesis testing procedure using a significance level of 0.01. The hypothesis test will determine if there is a statistically significant difference between the observed proportion of type A blood donations in our sample and the expected proportion in the general population (40%).
#### Hypothesis Testing Procedure
1. **Null Hypothesis (\(H_0\))**: The actual percentage of type A blood donations is 40%.
\[ H_0: p = 0.40 \]
2. **Alternative Hypothesis (\(H_A\))**: The actual percentage of type A blood donations is not 40%.
\[ H_A: p \neq 0.40 \]
3. **Significance Level (\(\alpha\))**: 0.01
4. **Sample Data**:
- Sample Size (\(n\)): 164
- Number of Type A Blood Donations (\(X\)): 89
5. **Sample Proportion (\(\hat{p}\))** of Type A Blood:
\[ \hat{p} = \frac{X}{n} = \frac{89}{164} \]
6. **Standard Error (SE)**:
\[ SE = \sqrt{\frac{p(1-p)}{n}} \]
7. **Test Statistic** (Z-score):
\[ Z = \frac{\hat{p} - p}{SE} \]
8. **Decision Rule**: Compare the Z-score to critical values from the Z-distribution for a two-tailed test at \(\alpha = 0.01\).
This analysis will help determine if the observed proportion of type A blood donations in the sample significantly deviates from the expected 40%, thus providing insights into the blood donation patterns at this blood bank.
---
By conducting this hypothesis test, we can draw conclusions about the blood donation trends and potentially inform strategies for managing blood donation stocks.
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