Section 2.1

7

  1. type answer here. OF is the position with the most MVPs.
  2. type answer here. there were 15 MVPs who played first base.
  3. type answer here. there were 15 more MVPs who played outfield than first base.
  4. type answer here. they should not treat three different positions as one position.

9

  1. type answer here. 69% of the respondents believe divorce is morally acceptable.
  2. type answer here. 55.2 million adult Americians believe divorce is morally wrong.
  3. type answer here. because it is a generalization based on the observed date, so this statement is inferential.

11

  1. type answer here. the proportion for 18-34 year old is 0.42. For 34-44 year olds, the proportion is 0.61.
  2. type answer here. the 55+ group.
  3. type answer here. the 18-34 years old group.

  4. type answer here. the older of the age gets, the bigger the likelihood is for people to buy a product that is made in America. 13

  5. total students surveyed: 125+324+552+1257+2518=4776 125/4776=0.0262 324/4776=0.0678 552/4776=0.1156 1257/4776=0.2632 2518/4776=0.5272

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

rel.freqq <- datt/sum(datt)

categoriess <- c("Never", "Rarely", "Sometimes", "Most of time", "Always")


answerr <- data.frame(categoriess,rel.freqq)

answerr
##    categoriess  rel.freqq
## 1        Never 0.02617253
## 2       Rarely 0.06783920
## 3    Sometimes 0.11557789
## 4 Most of time 0.26319095
## 5       Always 0.52721943
  1. type answer here. 52.72%
  2. type answer here. 0.0262+0.0678=9.40%
barplot(datt,main="Seat Belt Usage",names=categoriess, col =c("red","blue","green","yellow","orange"))

barplot(rel.freqq,main="Seat Belt Usage",names=categoriess, col =c("red","blue","green","yellow","orange"))

pie(datt,main="Seat Belt Usage",labels=categoriess, col =c("red","blue","green","yellow","orange"))

  1. type answer here. this statement is inferential, because it is inferring something based on the result.

15

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

rel.freq <- dat/sum(dat)

categories <- c("More 1", "Up to 1", "Few a week", "Few a month", "Never")


answer <- data.frame(categories,rel.freq)

answer
##    categories   rel.freq
## 1      More 1 0.36780488
## 2     Up to 1 0.18731707
## 3  Few a week 0.12878049
## 4 Few a month 0.07902439
## 5       Never 0.23707317
  1. type answer here. 0.2371
barplot(dat,main="Internet Usage",names=categories, col =c("red","blue","green","yellow","orange"))

barplot(rel.freq,main="Internet Usage(Relative Freq)",names=categories, col =c("red","blue","green","yellow","orange"))

pie(dat,main="Internet Usage",labels=categories, col =c("red","blue","green","yellow","orange"))

  1. type answer here. this statement provides an estimate.

Section 2.2

9

  1. type answer here. the value with the highest frequency is 8.
  2. type answer here. the value with the lowest frequency is 2.
  3. type answer here. the value of 7 was observed 15 times.
  4. type answer here. the value of 5 was observed 4 more times than the value of 4.
  5. type answer here. 15/100=0.15
  6. type answer here. the shape is bell-shaped.

10

  1. type answer here. 4 is the most frequent number of cars sold in a week
  2. type answer here. for 9 weeks.
  3. type answer here. 4+2+9+8+12+8+5+2+1+1=52 9/52=0.173
  4. type answer here. the shape is more right-skewed.

11

  1. type answer here. 200 students were sampled.
  2. type answer here. 10
  3. type answer here. IQ score Frequency 60-69 2 70-79 3 80-89 13 90-99 42 100-109 58 110-119 40 120-129 31 130-139 8 140-149 2 150-159 1
  4. type answer here. 100-109
  5. type answer here. 150-159
  6. type answer here. 11/200=0.055
  7. type answer here. no

12

  1. type answer here. 200
  2. type answer here. 0-119,200-399,400-599,600-799,800-999,1000-1199,1200-1399
  3. type answer here. 0-119
  4. type answer here. right-skewed.

  5. type answer here. the result could not derive from the information given. alcohol-related traffic fatalities in Texas is fewer than in Vermont. 13

  6. type answer here. skewed right, because most of the househould woulbe be to the left.
  7. type answer here. bell-shaped. most of the students would score in the middle of the range.
  8. type answer here. skewed right, most of the households would have 1-4 people.

  9. type answer here. life skewed. most of Alzgeimer’s patients are older-aged. 14

  10. type answer here. uniform. there is not a specific patterns to it.
  11. type answer here. right skewed. most of the students would be to the left.
  12. type answer here. left skewed. most of the patients would fall in oder-aged group

  13. type answer here. left-skewed. most of men would be to the right.