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
icon
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.
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.
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.
Expert Solution
steps

Step by step

Solved in 4 steps

Blurred answer
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman