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A contracting company claims that the proportion of the indicator lights on the road that are still working after 5 years is at least 90%; if a previous test of 100 indicators showed that the proportion that is still working after 5 years is 83%, with a significance level of 5%.
a) Find the value of the test statistic.
b) What is the p-value?
c) Should the contractor's claim of at least 90% working after 5 years be rejected?
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