Statistica Formulae 2

Question 1

Normal Distribution

Answer 1

X ~ N(mean, standard deviation^2)

Question 2

Normal Distribution Rule

Answer 2

68-95-99.7

1 sd-2 sd- 3 sd

Question 3

Standard Normal Distribution

Answer 3

Z ~ N(0, 1^2)

z = (X - mean) / sd

Question 4

Approximating Binomial Distribution

Answer 4

Mean = np
Sd = square root (np(1-p))

Continuity corrections: +- 0.5

Question 5

Hypothesis Testing

Answer 5

X bar ~ N(mean, sd^2/n)

Prob < sig level = reject H0

Mean in critical region = “”