We suspect that people who rely entirely on cell phones will as a group be young

Question

We suspect that people who rely entirely on cell phones will as a group be younger than those who have a landline telephone. Do data confirm this guess?

The Pew Research Center interviewed separate random samples of cell-only and landline telephone users and broke down the samples by age group. LANDLINE SAMPLE CELL-ONLY SAMPLE 1. Live with. parents 167 27 2. Rent 94 72 3. Own 49 13 4. Live in a dorm 6 16 5. Other/refused 19 1 Total = Landline sample =335 Cell Only Sample =129

Carry out a chi-square test for

A. H0:H0: homogeneity; that is, the distribution of living situation is the same in both populations versus or

B. Ha:Ha: lack of homogeneity; that is, the living situation distribution for the cell-only population differs from that for landline users.

Use =0.01.

2(±0.0001)= ________ P(±0.0001)=________ A. There is evidence that the living situation distribution for the cell-only population differs from that for landline users. or B.There is no evidence that the living situation distribution for the cell-only population differs from that for landline users

Explanation / Answer

X2 =67.4290

p value =0.0000

A. There is evidence that the living situation distribution for the cell-only population differs from that for landline users

Observed O parents rent own live in Other Total landline sample 167 94 49 6 19 335 cell only 27 72 13 16 1 129 Total 194 166 62 22 20 464 0.721983 Expected E=rowtotal*column total/grand total parents rent own live in Other Total landline sample 140.1 119.8491 44.7629 15.8836 14.4397 335 cell only 53.9 46.2 17.2 6.1 5.6 129 Total 194 166 62 22 20 464 chi square =(O-E)^2/E parents rent own live in Other Total landline sample 5.180 5.5752 0.4011 6.1501 1.4403 18.746 cell only 13.452 14.478 1.042 15.971 3.740 48.683 Total 18.631 20.053 1.443 22.121 5.180 67.4290

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