there are two sections in statistics

• descriptvie statistics
• inferential statistics —

population 에서부터 sample derive하는 것 → hypothesis testing 이 중요

confidence interval 은 비교적 가벼움!

significance level 에 대한 아무런 말이 없을 시, 0.05로 assume & also for the confidence interval

1. identify the population data and write “We are trying to estimate Mue at a 95% confidence level”

2. name = one-sample t-interval (for the population mean)

3. conditions =

1. SRS = “randomly selects 7 of his students”

2. Independence 10% rule = less than the 10% of the population size

3. Normality = n is greater than or equal to 30 ⇒ CLT = normal distributed 이라고 quesiton에 써있음

finding the t (95%, df = 7-1)* = 2.447

one sample