Question

Ente ivin w.livingcon Statistics Assessing Normality Assignment 1. The table below contains data on the heights of a random sample of adult US males. Construct a normal probability plot using your calculator, and state whether or not the data came from a pop that is normally distributed. Make a rough sketch of the normal probability plot or provide a clear picture of your calculator screen. ulation Heights (in) 69.5 65.9 64.3 70.5 67.7 61.8 69.0 67.3 64.0 66.7 2. The table below contains data on snowfall in a certain city in a random sample of years. Construct a normal probability plot using your calculator, and state whether or not the data came from a population that is normally distributed. Make a rough sketch of the normal probability plot Snowfall (in) 8.1 7.9 12.2 1.6 13.8 15.1 1.4 10.6 0.1 2.6 2.9 0.4

Answer 1

1)

rank,i	(i-0.5)/n	z score	data(height)
1	0.05	-1.64485	61.8
2	0.15	-1.03643	64
3	0.25	-0.67449	64.3
4	0.35	-0.38532	65.9
5	0.45	-0.12566	66.7
6	0.55	0.125661	67.3
7	0.65	0.38532	67.7
8	0.75	0.67449	69
9	0.85	1.036433	69.5
10	0.95	1.644854	70.5

z score can be calculated using z table or excel (=normsinv(z))

normaly probability plot 72 70 68 -66 64 62 60 -2 -1 0.5 0 0.5 1.5 Z-score

yes, data came from population that is normallly distributed