Nathan VanHoudnos

10/27/2014

- Midterm (test and quarter!) comments
- PSA
- Lecture 14 (covers pp. 160-165)

```
mean(midterm)
```

```
[1] 63.5493
```

```
median(midterm)
```

```
[1] 64
```

Percent of the class with a \( X \) or above:

```
[,1]
[1,] "A 11%"
[2,] "B 25%"
[3,] "C 41%"
[4,] "D 58%"
```

After dropping

- 3 lowest checkpoints
- 1 lowest homework

```
[,1]
[1,] "A 23%"
[2,] "B 62%"
[3,] "C 89%"
[4,] "D 94%"
```

**No “curve” is needed.**

Questions 4 and 5 differentiated the class.

- Homework 4 score had very little power to predict performance
**Time**seemed to be an issue for**some**students**Many students**were simply wrong.

**Mid-Quarter Grades**

To determine final exam length I will

**triple**the time it took me instead of doubling it.You will see something like Q4 and Q5 on the final.

The final Q4 and Q5 can replace the midterm Q4 and Q5 scores.

- Midterm (test and quarter!) comments
- PSA
- Lecture 14 (covers pp. 160-165)

I need to cancel **my** office hours this week.

If you need to meet with me, as always, feel free to send me an email.

Aaron will still hold his office hours on Thursday.

(For that matter send Aaron email if you can't make his either.)

From Emily Quinn (Animator for Adventure Time):

Being intersex means that you were born with differences in your sexual characteristics — these differences can affect genes, chromosomes, genitalia, reproductive organs, hormones and also things like body hair and how much you sweat.

Quinn's AMA on reddit (yesterday).

Surprising Fact: Intersex is as common as being a natural redhead (1/20,000).

For pedagogic reasons, Stat 202 gender is binary.

- Midterm (test and quarter!) comments
- PSA
- Lecture 14 (covers pp. 160-165)

Assume that the height of adult men is normally distributed with a mean of 69 in. and a standard deviation of 2.8 in.

Assume that the height of adult men is normally distributed with a mean of 69 in. and a standard deviation of 2.8 in.

- Randomly select 15 men from the population and measure their heights:

```
67.2 69.5 66.7 73.5 69.9 66.7 70.4 71.1 70.6 68.1 73.2 70.1 67.3 62.8 72.1
```

Assume that the height of adult men is normally distributed with a mean of 69 in and a standard deviation of 2.8 inches.

- Randomly select 15 men from the population and measure their heights:
- Make a histogram of those randomly selected 15 men.