chapter 18 - further hypothesis testing

Question 1

samples means info

Answer 1

• clustered around same mean as original data
• less spread out

Question 2

sample mean distribution

Answer 2

~N(μ, σ²/n)

Question 3

hyp test - sample mean

Answer 3

H0 μ =
H1 μ </>/!=
upper tail - find P(X >= val)
lower tail - find P(X <= val)
if p< sig level reject H0

Question 4

hyp test - correlation coefficient

Answer 4

H0 p = 0
H1 p >/</!= 0
r is in question
find crit value from table
if |r| > crit val reject H0