Chapter 2.1 -- Regression.Estimation

Question 1

Statistical Estimation

1. Population w/ mean = ???
3. The sample data provide a value for the sample mean 𝑥
   4.

Answer 1

2. A simple random sample of 𝑛 elements is selected
   from the population
3. The value of 𝑥 is used to make inferences about the value of μ.

Question 2

Point Estimate vs Interval Estimate

Answer 2

Point estimate
* sample mean
* sample proportion

Interval estimate
* confidence interval for mean
* confidence interval for proportion

Question 3

If the population standard deviation 𝜎 is unknown,
use the …
If 𝑛 is large enough, you might also …

Answer 3

sample standard deviation 𝑠 and the 𝑡-distribution.

use 𝑠 and the standard Normal distribution.

Question 4

Effect of Sample Size

Answer 4

Larger sample size –> smaller interval

(why?)

Question 5

90% interval –> 1.645
99% interval –> 2.58
95% interval –>

Answer 5

1.96

X +- z(CI) * sd/sqrt(N)

Question 6

Estimation for population mean

Answer 6

check slide 19