M358K Homework #3
Due Thursday, September 20, 2012
A second pass through the material indicates that there are parts of the R tutorial that need to be reorganized, updated, and/or eshed out with additional information. The way I will deal with this for
no
1. pnorm(71
,64.5,2.5)pnorm(69,64.5,2.5)
[1]0.03126913
2.During several times to repeat
x=rnorm(20,514,11
7)
>hist(x)
>qqnorm(x)
x=sample(1:20,20,replace=T)
>hist(x)
>qqnorm(x)
x=seq(0,
10,.001)
>plot(x,dexp(x),type="l")
>x=rexp(20)
>qqnorm(x)
I would say
M358K Homework #3 SOLUTIONS
1. The graphic shows what percentage of the surface area of the continental US experienced moderate to
extreme drought conditions 1896-2012. For breaks = 5 the bin boundaries would be 020%, 2140%, 41
60%, 6180%, 81100%
Normally
M358K Homework #2 SOLUTIONS
1. Proof:
=
1n
( x k ) 2
n k=1
(1)
=
1n 2
(x 2xk + 2 )
n k=1 k
(2)
=
2
1
n
=
=
1
n
1
n
n
n
x2 2
k
k=1
n
xk + n2
(3)
k=1
x2 2 n + n2
k
(4)
x 2 2
k
(5)
k=1
n
k=1
2. Proof:
n
n
xk nx = 0
(xk x) =
k=1
(6)
k=1
3. SDM 4-6:
(a) Bimoda
M358K Homework #1 SOLUTIONS
SDM 2-2: Categorical
SDM 2-4: Quantitative
SDM 3-8:
a) G
b) No. This bar graph only shows the ratings at a particular moment in time; it does not give any indication
of what changes might have occurred over time.
SDM 3-20:
a) T
M358K Homework #9
Due Thursday, November 1, 2012
Practice Problems: Dont turn these in, but try these problems as a probability self-check:
SDM pp. 350353 #1, 9, 13, 15, 17, and 33.
1. M358K R Tutorial:
Exercises #13, 14
(Note that Ive xed some bugs in th
M358K Homework #8
Due Thursday, October 18, 2012
Normal Quantile Plots (aka Q-Q plot or Normal Probability Plot)
Normal Quantile Plots are a heuristic method for helping you decide whether or not you can assume that
a data set you are working with came fr
M358K Homework #5
Due Thursday, October 4, 2012
A generally applicable hint for SDM exercises: If youre having trouble with an assigned textbook exercise, take a look at the
odd numbered problem immediately preceding it. The textbook always seems to pair