Chapter 23: Inference for a Difference of Means

Question 1

2-SampTInt & 2-SampTTest Conditions

Answer 1

1. Both random samples
2. n≤10% of pop. for each
3. n1≥30 & n2≥30 (CLT) or sample data shows no strong skew or outliers

Question 2

2-SampTInt On Calculator

Answer 2

(Data and input into lists if no mean and SD given)
Stats
x̄1: sample mean group 1
Sx1: sample SD group 1
n1: sample size group 1
x̄2: sample mean group 2
Sx2: sample SD group 2
n2: sample size group 2
C-Level: CI% as decimal
Pooled: No

Question 3

2-SampTTest On Calculator

Answer 3

(Data and input into lists if no mean and SD given)
Stats
x̄1: sample mean group 1
Sx1: sample SD group 1
n1: sample size group 1
x̄2: sample mean group 2
Sx2: sample SD group 2
n2: sample size group 2
μ1 (≠μ2; <μ2; >μ2)
Pooled: No