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In a random sample of 800 customers selected for a short phone interview, 96 have stated that they have received their shipments late. The company's claim is that the percentage of late shipments is at or below 10%. Conduct a hypothesis test at a 0.05 level of significance.
1) The calculated (observed) value of the test statistic is?
2) What is the p-value for the test?
3) Is there sufficient evidence that the percentage of late shipments is larger than 10%?