Estimation significance tests and P values

Question 1

How to calculate confidence interval?

Answer 1

Mean +/- 1.96 x SE (p)

Question 2

What’s the relationship between sample size and standard error?

Answer 2

Larger sample size, smaller standard error (inversely proportional)

Question 3

What does normal distribution require?

Answer 3

95% of the data should be within 2 standard deviations above/below the mean

Question 4

When do you use standard deviation vs standard error?

Answer 4

-Standard error used for bigger population
-Standard deviation used within the sample

Question 5

Relationship between p value and confidence interval

Answer 5

P value slightly greater than 0.05 (slightly not significant) = Confidence interval will only just straddle null hypothesis of 0