$1.00 Thomas Delivery has a fleet of 24 truck
Thomas Delivery has a fleet of 24 trucks that are utilized for the companies; business. Electro-Lite, a manufacturer of spark plugs, claims that its spark plugs have an average life in excess of 25,000 miles. The purchasing agent at Thomas Delivery purchased 24 sets and found that the sample average life was 26,300 miles, the sample standard deviation was 1,500 miles, and the computed test statistic was t = 3.423. Based on these findings, at the 0.05 level, is there enough evidence to accept the manufacturer's claim? A. Electro-Lite claims are just an advertising promotion. B. Electro-Lite claims are not supported by the test results. C. Electro-Lite claims cannot be supported or denied with the test results. D. Electro-Lite claims are supported; the spark plugs do exceed the mean of 25,000 miles.
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