4step 25.32 Cell-only Versus Landline Users. We suspect that people who rely entirely on cell phones will as a group be younger than those who have landline telephones. 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: 14 .I CELLAGE Landline Sample Cell-Only Sample Age 18-29 335 374 Age 30-49 1242 347 Age 50-64 1625 146 Age 65 or older 1481 36 Total 4683 903 a. Should you use a chi-square test of independence or homogeneity? b. Do a complete analysis of these data, following the four-step process