# Stat 202: Lecture 8 (covers pp. 112-115)

Nathan VanHoudnos
10/10/2014

### Agenda

2. Checkpoint #9 results
3. Lecture 8 (covers pp. 100-111)

Homework 3

• was released on Wednesday, and
• does not include any R.

Your solutions should include both symbols and English words explaining those symbols.

• follow the exmample of these slides.
• do not simply show the symbols.

### Agenda

2. Checkpoint #9 results
3. Lecture 8 (covers pp. 100-111)

### Checkpoint #9 results

• 67 of 76 students
• 75% correct

### Participation in OLI Activities

Bottom third: completed between 0 and 33% of the activities.

Middle third: 34% to 95%

Top third: 95% to 100%

### Checkpoint #9: Questions 5 - 7

According to the information that comes with a certain prescription drug, when taking this drug, there is a 20% chance of experiencing nausea (N) and a 50% chance of experiencing decreased sexual drive (D). The information also states that there is a 15% chance of experiencing both side effects.

What is the probability of

• experiencing nausea or a decrease in sexual drive?
• experiencing only nausea?
• experiencing neither of these side effects?

### Checkpoint #9: Questions 5 - 7

Make a Venn Diagram:

Recall:

20% chance of experiencing nausea (N), 50% chance of decreased sexual drive (D), and a 15% of both.

### Checkpoint #9: Questions 5 - 7

What is the probability of

• experiencing nausea or a decrease in sexual drive?
• experiencing only nausea?
• experiencing neither of these side effects?

### Two-way probability table

20% chance of experiencing nausea (N), 50% chance of decreased sexual drive (D), and a 15% of both.

Fill in the given information:

      |  D   | not D | Total
------|------|-------|------
N     | 0.15 |       |  0.20
------|------|-------|------
not N |      |       |
------|------|-------|------
Total | 0.50 |       |  1


### Two-way probability table

20% chance of experiencing nausea (N), 50% chance of decreased sexual drive (D), and a 15% of both.

Figure out the rest:

      |  D   | not D | Total
------|------|-------|------
N     | 0.15 |       |  0.20
------|------|-------|------
not N |      |       |  0.80
------|------|-------|------
Total | 0.50 | 0.50  |  1


### Two-way probability table

20% chance of experiencing nausea (N), 50% chance of decreased sexual drive (D), and a 15% of both.

Figure out the rest:

      |  D   | not D | Total
------|------|-------|------
N     | 0.15 | 0.05  |  0.20
------|------|-------|------
not N | 0.35 | 0.45  |  0.80
------|------|-------|------
Total | 0.50 | 0.50  |  1


### Plain-text Venn Diagram

Venn Diagram

Table

     |  D |not D|Tot.
-----|----|-----|----
N    | .15| .05 | .20
-----|----|-----|----
not N| .35| .45 | .80
-----|----|-----|----
Total| .50| .50 | 1


### Two-way probability table

Table

     |  D |not D|Tot.
-----|----|-----|----
N    | .15| .05 | .20
-----|----|-----|----
not N| .35| .45 | .80
-----|----|-----|----
Total| .50| .50 | 1


What is the prob. of

• experiencing nausea or a decrease in sexual drive?
• experiencing only nausea?
• experiencing neither of these side effects?