Quiz 2, Summer 2023, Solutions

Q1:
6

Q2:
100

Q3:
10

Q4:
.68

Q5:
> 1 - pnorm(0,6,10)
[1] 0.7257469


Q6:

.2*6 + .8*10 = 9.2

Q7:

> 10*12*.4
[1] 48

Q8:
> VP = .2^2 * 100 + .8^2 * 144 + 2*.2*.8*(10*12*.4)
> VP
[1] 111.52

Q9:

345

Q10:

> 15^2/5
[1] 45

Q11:

> pnorm(370,345,sd) - pnorm(330,345,sd)
[1] 0.9872294

Q12:

> se = sqrt(.6*.4/1000)
> 
> se
[1] 0.01549193
> 
> ci = .6 + 2*se*c(-1,1)
> ci
[1] 0.5690161 0.6309839

Confidence interval is far from .5

True