G18.8

Driving while drinking alcohol.Table 18.7 presents cross-tabulated results for the number of adolescents who drove or rode in a car or other vehicle when the driver was drinking alcohol. Prevalence proportions varied from 11.3% (non-Hispanic white) to 4.9% (non-Hispanic black). Test the data in Table 18.7 for significance with a chi-square testing method.

Group	Yes (rode/drove with driver driving)	No	Total
NonHisp White	243 (11.3%)	1911	2154
NonHisp AA	25(4.9%)	483	508
Hispanic	55 (10.5%)	471	526
Total	323(10.1%)	2865	3188

Hypotheses:

H0:

Ha:

Assumptions:

STATA OUTPUT

. tabi 243 1911\25 483\55 471, chi2 expected

+--------------------+

| Key |

|--------------------|

| frequency |

| expected frequency |

+--------------------+

| col

row | 1 2 | Total

-----------+----------------------+----------

1 | 243 1,911 | 2,154

| 218.2 1,935.8 | 2,154.0

-----------+----------------------+----------

2 | 25 483 | 508

| 51.5 456.5 | 508.0

-----------+----------------------+----------

3 | 55 471 | 526

| 53.3 472.7 | 526.0

-----------+----------------------+----------

Total | 323 2,865 | 3,188

| 323.0 2,865.0 | 3,188.0

Pearson chi2(2) = 18.3343 Pr = 0.000

Results:

Interpretation:

Conclusion: