Question

# We suspect that people who rely entirely on cell phones will as a group be younger...

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 Age 18-29 383 342 Age 30-49 349 1252 Age 50-64 141 1615 Age 65 or older 45 1474 Total 918 4683

(a) Should you use a chi-square test of independence or homogeneity? (pick one)

(b) Carry out a chi-square test. Test H0:H0: the distribution of age groups is the same for landline and cell-only individuals versus Ha:Ha: the distributions are different. Use α=0.01α=0.01.

χ2=

P=

pick one:

 There is no evidence of an association between age group and the type of telephone
 There is evidence of an association between age group and the type of telephone

The statistical software output for this problem is:

Hence,

a) Independence

b) = 1026.0275

P = 0

There is evidence of an association between age group and the type of telephone

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