Johanna Evans Stat 107 HW 10 2/26/2008 10.2 The sum of the amounts spent on the seven types of games is 2078.2. It is not exactly equal to the totally given in the table because numbers are rounded separately. This is called roundoff error. 10.5 No, the graph does not fairly represent the data because it looks like N2K’s 12% is a lot smaller than half of CDNow’s 33%. Instead, it is about 1/5th the size, which is misleading. 10.6

Murders for 2001

handguns49%

other f irearms14%

knives13%

body part7%

blunt objects5%

other methods12%

handguns

other f irearms

knives

body part

blunt objects

other methods

10.7 a) Seasonal variation is visible in the graph with sharp increases and decreases within every year. I would expect that the price would be high when oranges were not in season, and the price to be lower, when there is more of an abundance of oranges while in season. b) The overall trend in orange prices is that the price index has been rising since 1990. 10.11

Births to Unwed Mothers In the U.S.

0

5

10

15

20

25

30

35

1960

1965

1970

1975

1980

1985

1990

1995

2000

year

perc

enta

ge o

f birt

hs

Series1

Births of Unwed Mothers In The U.S.

1960, 5.3

1980, 18.4

2000, 33.2

0

5

10

15

20

25

30

35

1960 1980 2000Ye a r

Series1

10.16 What explains this discrepancy in numbers is that in June a lot of seasonal employment is beginning, which would not be counted in the official report. 10.21

Deportable aliens caught by the U.S. Boarder Patrol

0

200

400

600

800

1000

1200

1400

1600

1800

1971

1975

1979

1983

1987

1991

1995

1999

year

coun

t (th

ousa

nds)

Series1

10.23 It is not correct to display this data in a pie chart because the information is not necessarily categorical. An adolescent could have done more than one of these things, so it the addition of these percentages would not add up to a whole. 10.24 a) 44% from motor vehicle accidents 14% from poisoning 3% from drowning 3% from fires 1% from fire arms There was 35% of accidental deaths due to other causes.

b)

Accidental Deaths

motor vehicle accidents

44%

poisoning14%

drowning3%

fires3%

fire arms1%

other causes35%

motor vehicle accidentspoisoningdrowningfiresfire armsother causes

10.25

Average annual intereste rates paid by money market funds

0

2

4

6

8

10

12

14

16

18

20

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

year

rate Series1

b) The rate cycle reached peaks in 1974, 1981, 1984, 1989, and 1995. c) The interest rates reached their overall peak during 1981 and has had a general downward trend since.