Refer to the Process Safety Progress (Sept. 2004) study of an emergency response system for incidents involving toxic chemicals in Taiwan, Exercise 3.5. In a sample of 250 toxic chemical incidents logged since the system was implemented, 15 occurred in a school laboratory. Suppose you want to conduct a test of hypothesis to determine if the true percentage of toxic chemical incidents in Taiwan that occur in a school laboratory is less than 10%.

a. Set up the null and alternative hypothesis for the test.

b. Give the rejection region for α = .01.

c. Compute the value of the test statistic.

d. Give the appropriate conclusion for the test.

Data from Exercise 3.5

Process Safety Progress (Sept. 2004) reported on an emergency response system for incidents involving toxic chemicals in Taiwan. The system has logged over 250 incidents since being implemented in 2000. The accompanying table gives a breakdown of the locations where these toxic chemical incidents occurred. Consider the location of a toxic chemical incident in Taiwan.

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Location Percent of Incidents School laboratory 6% In transit 26% Chemical plant 21% Nonchemical plant 35% Other 12% Total 100%