Based on this dotplot and the sample of last month's on-time completions, which conclusion can be drawn?
A contractor claims that she finishes a job on time 90%
of the time. Last month, she only completed 7 out of
her 10 jobs on time. To see if this is surprisingly low, a
simulation was conducted 100 times under the
assumption that she really does complete 90% of her
jobs on time
The dotplot contains 100 trials of this simulation,
O The contractor's true, on-time completion rate is only
50%.
O It is most likely that the contractor will complete
about 9 out of 10 jobs.
O If we used a larger sample size of 40 jobs, the
simulated dotplot would be different; therefore, we
cannot draw a conclusion.
0 The dotplot does not provide convincing evidence
that her true, on-time completion rate is less than
90% because 7 or fewer on-time completions
happened 19% of the time in the simulation.