1. You randomly survey people in the mall about whether or not they regularly us
ID: 3045645 • Letter: 1
Question
1. You randomly survey people in the mall about whether or not they regularly use text messaging. The result are shown in the tally sheets below based on the people's ages Does Not Text Regularly Texts Regularly Age Tally Tally Age 20-29 30-39 ! 40-49 40-49r a. Make a two-way table that includes the marginal frequencies b. Make a two-way table that shows both the joint and marginal relative frequencies. Round to the nearest hundredth, if necessary c, What is the probability that someone who is between the ages of 20-29 also texts regularly? d. What is the probability that someone who is between the ages of 40-49 also texts regularly? e. Does the data show a relationship between age and texting? Explain.Explanation / Answer
Answer:
a).
Age
Regular
Not Regular
Total
20-29
25
7
32
30-39
11
13
24
40-49
2
10
12
Total
38
30
68
b).
Age
Regular
Not Regular
20-29
0.37
0.10
0.47
30-39
0.16
0.19
0.35
40-49
0.03
0.15
0.18
0.56
0.44
1.00
c).
P=28/68=0.37
d).
P=2/68=0.03
e).
Yes , there is relation, younger age text regularly than elder.
Age
Regular
Not Regular
Total
20-29
25
7
32
30-39
11
13
24
40-49
2
10
12
Total
38
30
68
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.