Perform a hypothesis test to determine if a difference exists in
the proportion of uninsured drivers between the counties of Santa
Clara and San Mateo. A random sample of 150 drivers from Santa
Clara found that 42 were uninsured. A random sample of 125 drivers
from San Mateo found that 23 were uninsured. Define Population 1 as
Santa Clara drivers and Population 2 as San Mateo drivers.
Construct a 90% confidence interval for the difference in
population proportions and interpret the results.
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