Biostatistics

HW:

Smoke tobacco cigarettes per day:

Populations:

Males 36 38 38 38 40

Females 30 30 32 34 34

Part 1:

Males: Mean / Variance / Standard deviation

Mean:

µ = ∑x

N =

36+38+38+38+40

5 =

190

5 = 38

Variance:

σ2 = ∑(x−μ)2

N =

4+0+0+0+4

5 =

8

5 = 1.6

Standard deviation:

𝜎 = √𝜎2 = √1.6 = 1.3

Females: Mean / Variance / Standard deviation

Mean:

µ = ∑x

N =

30+30+32+34+34

5 =

160

5 = 32

Variance:

σ2 = ∑(x−μ)2

N =

4+4+0+4+4

5 =

16

5 = 3.2

Standard deviation:

𝜎 = √𝜎2 = √3.2 = 1.8

Part 2:

Write two paragraphs compare males to females on smoking behavior. Compare Mean,

Variance, and Standard deviation and what the number tell us?