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Last year, a companys service technicians took an average of 2.6 hours to respond to trouble calls from business customers who had purchased service contracts. Assume respond time follows a normal distribution. This year, in an effort to improve, the company hired more service technicians. The manager randomly sampled 15 calls and found the average response time to be 2.2 hours, with a sample standard deviation of 0.4 hours. Let alpha-0. 10. ii) Calculate the test statistic Numeric Answer Type your response

math   Statistics-And-Probability   
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→ n-_ 15, χ.-2+2, 6-o.ct 22-G -3.8チ29

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