# data[].attributes.body
(Sec. 21) Question 13

**Checked. Please see my comments on how you should write the statement of CI.

# data[].attributes.body
Textbook exercise 3 Q8
**Checked. Please notice the feedback.

# data[].attributes.headline
Group 10 - K Group [Section 41] Textbook Q10

# data[].attributes.subject
Group 10 - K Group [Section 41] Textbook Q10

# data[].attributes.body
**Checked. Well done!

# data[].attributes.body
Ch. 3 Supplementary Ex.
**Checked. Well done!

# data[].attributes.body
Section 21
*Checked. Well done.

# data[].attributes.body
*Checked. Good effort !

# data[].attributes.body
*Checked. Please see my comments.

# data[].attributes.body
*Checked. All answers are correct. However, please state the CI that you work on. For example, in this question, write "99% CI for mu1-mu2 is" and followed by the calculation procedure.

# data[].attributes.body
Supplementary Exercise Chapter 3

*Checked. The solution steps and answers are all correct.

However, a better justification for part (b) should be "because the CI contains zero".

Although your statement sounds similar to what I suggested above, but the implications are different.

Anyhow, at your level, your statement in (b) can be accepted.

Well done.

# data[].attributes.body
*Checked. Please see my comments. "No equation" there means "no equality sign" when you state a CI. It is a statement, not an equation.

# data[].attributes.body
*Checked. These questions are from Statistics for Engineers Text Book Ch. 3 Exercise. The steps and solutions are all correct. Well done!

# data[].attributes.body
**Checked. Well done! Your solutions are correct!

# data[].attributes.body
*Checked. Please see my comments on the 2nd part.

# data[].attributes.headline
SUPPLEMENTARY EXERCISE CHAPTER 3 QUESTION 23 GROUP 12

# data[].attributes.subject
SUPPLEMENTARY EXERCISE CHAPTER 3 QUESTION 23 GROUP 12

# data[].attributes.body
Group 12 : Kami
*Checked. Please see my comments. A lot of errors there. Hope your group can improve better.

# data[].attributes.body
1. Jareer Murtaza Amin A17MB4007
2. Harris Farhan bin Bakri A17KMOO97
3. Divendran A/L Chandran A18KM0076
4. ARNAB TANVIR SHAMSUZZOHA A17KM4002

Re-do please

# data[].attributes.body
Muhammad’s GROUP:
1. Muhammad Fareez Allany Bin Khairul Anuwar A18KM0228
2. Muhammad Imanrullah Bin Hapizal A18KM0254
3. Muhammad Marzuqi bin Mohd Tom
A18KM0263
4. Muhammad Aiman bin Jaffar A18KM0189

**Checked. Please take note on the calculation of degrees of freedom when you have
Case 3b.

# data[].attributes.headline
SUPPLEMENTARY EXERCISE 3 QUESTION 6 GROUP 8

# data[].attributes.subject
SUPPLEMENTARY EXERCISE 3 QUESTION 6 GROUP 8

# data[].attributes.body
**Checked. Well done girls. Your group solutions are correct!

# data[].attributes.body
*GROUP 13
**Checked. Your assumption is correct! Also your solutions are correct! Well done.

# data[].attributes.body
**Checked. Well done! Your answers are all correct!

# data[].attributes.body
Question-17, Group-17 (N. Islam), Section - 21

*Checked. Your group answer is correct. However, in the CI formula, you should use sample proportion p in the square root, NOT pi because pi is the parameter that you do not know the value and to be estimated via CI.

# data[].attributes.headline
QUESTION 18- SUPPLEMENTARY EXERCISE CHAPTER 3

# data[].attributes.subject
QUESTION 18- SUPPLEMENTARY EXERCISE CHAPTER 3

# data[].attributes.body
GROUP 11: STATISTICS A+

*Checked. Your group answers are correct.

Note: It'll be better if you can write properly such as writing "95% CI for the population variance, sigma^2 is..." Hence, the "95% CI for the population sd, sigma is..."

# data[].attributes.headline
QUESTION 4 - SUPPLEMENTARY EXERCISE CHAPTER 3

# data[].attributes.subject
QUESTION 4 - SUPPLEMENTARY EXERCISE CHAPTER 3

# data[].attributes.body
Group 3 : Sememey Group

**Checked. Well done! Your group solutions are all correct! Thumbs up!!

# data[].attributes.body
Q3) GROUP 2 : Rich Daddy

*Checked. Well done. Your steps and solutions are clear & correct.

# data[].attributes.body
Group 6 : Power
**Checked

# data[].attributes.body
Section 41
Group 13 : PI Group
*Checked. All your solutions are correct. Well done!

# data[].attributes.body
Group 5: DAEBAK

**Checked

# data[].attributes.body
**Checked.

# data[].attributes.headline
Supplementary Exercise 3. Question 8 (Section 41, Group 12, Neo's Group) 

# data[].attributes.subject
Supplementary Exercise 3. Question 8 (Section 41, Group 12, Neo's Group) 

# data[].attributes.body
Group 8 : Sunshine

**Checked. Your method is correct and answers are acceptable.

Friendly reminder: If possible, please do not round off the values too early especially when you obtained sample mean and sample sd from calculator. Take up to at least 4 decimal places or 4 sf to minimize the rounding off error at the final answers.

# data[].attributes.headline
Textbook Questions 11 & 12 (Section 41, Group 15 Tiew's)

# data[].attributes.subject
Textbook Questions 11 & 12 (Section 41, Group 15 Tiew's)

# data[].attributes.body
**Checked

# data[].attributes.headline
Question 27, Section 21 Group 11, Dominators

# data[].attributes.subject
Question 27, Section 21 Group 11, Dominators

# data[].attributes.body
**Checked