Chapter 1, Problem R1.4RE

(a)

To determine

To find: the percent of the students who responded were Facebook users.

Answer to Problem R1.4RE

67.58%

Explanation of Solution

Given:

	Younger (18-22)	Middle (23-27)	Older (28 and up)
Yes	78	49	21
No	4	21	46

Calculation:

The row and column totals are

	Younger (18-22)	Middle (23-27)	Older (28 and up)	Total
Yes	78	49	21	148
No	4	21	46	71
Total	82	70	67	219

Students which are responding Facebook users = $\frac{148}{219}=67.58\%$

(b)

To determine

To find: the percent of the students in the sample were aged 28 or older.

Answer to Problem R1.4RE

30.59%

Explanation of Solution

Given:

	Younger (18-22)	Middle (23-27)	Older (28 and up)
Yes	78	49	21
No	4	21	46

Calculation:

The row and column totals are

	Younger (18-22)	Middle (23-27)	Older (28 and up)	Total
Yes	78	49	21	148
No	4	21	46	71
Total	82	70	67	219

Students which are responding for aged 28 and older= $\frac{67}{219}=30.59\%$

(c)

To determine

To find: the percent of the students who responded were older Facebook users.

Answer to Problem R1.4RE

9.589%

Explanation of Solution

Given:

	Younger (18-22)	Middle (23-27)	Older (28 and up)
Yes	78	49	21
No	4	21	46

Calculation:

The row and column totals are

	Younger (18-22)	Middle (23-27)	Older (28 and up)	Total
Yes	78	49	21	148
No	4	21	46	71
Total	82	70	67	219

Students which are responding for older Facebook users = $\frac{21}{219}=9.589\%$

(d)

To determine

To find: the percent of the Facebook users in the sample were younger students.

Answer to Problem R1.4RE

37.44%

Explanation of Solution

Given:

	Younger (18-22)	Middle (23-27)	Older (28 and up)
Yes	78	49	21
No	4	21	46

Calculation:

The row and column totals are

	Younger (18-22)	Middle (23-27)	Older (28 and up)	Total
Yes	78	49	21	148
No	4	21	46	71
Total	82	70	67	219

Students which are responding are younger = $\frac{82}{219}=37.44\%$