Based on the dotplot of the simulation results and the random sample from last month's new driver's
licenses, which conclusion can be drawn?
A worker at the local Department of Motor Vehicles
(DMV) claims that 60% of teenagers smile in their
driver's license photo. In a random sample of 10
teenagers from last month's new driver's licenses,
only 4 of them were smiling in their photos. To see
how unusual this sample is, 100 simulated trials were
conducted under the assumption that 60% of
teenagers smile for their driver's license photo.
Driver's Licenses
O The actual proportion of teenagers who do not
smile is only 8%
O It is clear that exactly 6 out of 10 teenagers will
smile in their driver's license photo.
O If we continued to take more samples of 10
teenagers, the center of the distribution would shift
to 6
O There is about an 8% chance that 4 or fewer
teenagers smiled for their photo. This is not unusual
and is not convincing evidence that the true
probability is less than 60%.
25
20
15
Frequency
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O
DO
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