2.1

7

  1. China

  2. 50 million

  3. 350 million

  4. relative frequency would be more accurate

9

  1. 69%

  2. 55.2 million

  3. inferential- only 8% of the population was survery

11

  1. 18-34: 42% 35-44: 61%

  2. 55+ year olds

  3. 18-35

  4. The older you are the more likely you are to buy when a product is made in america

13

Never: 2%

Rarely: 6%

Sometimes: 11%

Most of the time: 26%

Always: 52%

  1. 52%

  2. 9%

d e f

my_data <- c(125, 324, 552, 1257, 2518)

groups <- c("Never", "Rarely", "Sometimes", "Most", "Always")

barplot(my_data, main = "Wearing Seatbelts", names.arg = groups)

barplot(my_data, main = "Wearing Seatbelts", names.arg = groups, col = c("red","blue","green","yellow", "black"))

rel_freq <- my_data / sum(my_data)

barplot(rel_freq, main = "Wearing Seatbelts", names.arg = groups, col = c("red","blue","green","yellow","black"))

pie(my_data, labels = groups, main = "Wearing Seatbelts")

  1. inferential

15

More then 1 hour: 36%

Up to 1 hour: 18%

A few time a week: 12%

A few times a month: 7%

Never: 23%

  1. 23.7%

c d e

my_data <- c(377, 192, 132, 81, 243)

groups <- c("More 1", "Up to 1", "Few times week", "Few times month", "Never")

barplot(my_data, main = "Use the internet", names.arg = groups)

barplot(my_data, main = "Use the internet", names.arg = groups, col = c("red","blue","green","yellow", "black"))

rel_freq <- my_data / sum(my_data)

barplot(rel_freq, main = "Use the internet", names.arg = groups, col = c("red","blue","green","yellow","black"))

pie(my_data, labels = groups, main = "Use the internet")

  1. they couldnt ever talk to and survey in every adult in america

2.2

9

  1. 8

  2. 2

  3. 15

  4. 4

  5. 15%

  6. bell shaped

10

  1. 4

  2. 9

  3. 17.3%

  4. right skew

11

  1. 200

  2. 10

  3. 60- 1% 70- 1.5% 80- 6.5% 90- 21% 100- 29% 110- 20% 130- 15.5% 140- 1% 150- .05% 160- 0

  4. 100-110

  5. 150-160

  6. 5.5%

  7. no

12

  1. 200

  2. Skip this problem

  3. 0-200

  4. right skew

  5. data doesnt say states

13

  1. Left: more poor than rich

  2. bell: most students are average

  3. right: families usually live in houses

  4. left: older people get alzheimers

14

  1. right: most people dont drink heavily

  2. bell: each grade has equal numbers of students

  3. left: old people need hearing aids

  4. bell: men are all different heights, mostly average height