Chapter 1
Fully understand the process to calculate mean, standard deviation, variance, and sample size.
Chapter 2
Lecture 1: Before the lecture
o (preview) Chapter 2 HW1: Normal VS Student T (3pts)
• Lecture 1
o Lecture videos-3
• Lecture 1: After the lecture
o Chapter 2 HW2 : Normal Distribution (3pts)
• Lecture 2: Before the lecture
•
o (Preview) Software choice
o (Preview) Videos: Mean variance and Z-score of the sample mean X-bar
• Lecture 2
o Lecture videos-4
• Lecture 2: After the lecture
o Chapter 2 HW3: Z score of X-bar (1pt)
o Chapter 2 HW4: More on Z-score (*)
o Calculate the central tendency, variability, and distribution.
Chapter 2 HW1: Normal VS Student T (3pts)
(Preview) Videos: Mean variance and Z-score of the sample mean X-bar
Questions to Keep in Mind as you Watch
• What is the mean of the sample mean-bar?
• What is the variance of the sample mean X-bar?
• How to construct the Z-score of the sample mean X-bar?
• Think about the differences between the Z-score of X-bar and that of a typical variable X. Why is that?
Lecture videos-4
- Normal vs T distributions (important)
- Learn about a few more statistics
Z-statistic
5 – z-Statistics.mp4
T-statistic
6 – t-Statistics.mp4
Critical Values of T and Normal distributions (How to check Z/T tables)
7 – Critical z and t-Statistics.mp4
Chapter2 HW 3: Z score of X-bar (1pt)
Fully understand the difference between Z score for X and X-bar.
Chapter 2 HW4 : More on Z-score (no submission)
Skills
The purpose of this chapter of our course is to help you understand how to approach an unfamiliar database.
• MLO 2.1: Calculate central tendency, variability, and relative standing in the data (Software). (CLO 2)
Tasks
These are additional exercises for those of you who needs more practice with the concept of Z-score. You do not have to turn these in. Find the corresponding Z-scores using graphic illustrations and the Standard Normal Distribution Table:
• a. The area under the standard normal distribution’s bell-shaped curve from negative infinity to the Z-score is 0.95. In another word, the probability of x being lower than the Z-score is 0.95. Find the Z-score
• b. Similar question, replace area with 0.05
• c. Similar question, replace area with 0.01
• d. Similar question, replace area with 0.99
Chapter 3 HW1: How to use a T table
Purpose
Recall ECON 109/1090 lesson on T-tables.
Skills
Use the T-table
Tasks
• Determine the critical value of T-distribution in each of the following circumstances by using a T-table (two-tails):
1- 1-α=0.95,n=10
2- 1-α=0.99,n=10
3- 1-α=0.95,n=32
4- 1-α=0.95,n=65
5- 1-α=0.90,n=16
• Compare them with these answers: 2.2622 3.2498 2.0395 1.9977 1.7531
• If the concept of looking up a critical value in T table is not familiar to you, please watch this video (Links to an external site.).
- Confidence Intervals with known/unknown population standard deviation