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record reveals that the average life of the spark plug set is normally distributed with a mean of 22,100 miles. spark plug manufacturer claimed that he issued plugs have an average life of more than 22,100 miles. a truck owners buy 18 sets of spark plugs and found that the average life is 23,400 rock samples and the sample standard deviation is 1,500 batu.berdasarkan these findings, whether there is sufficient evidence to accept the manufacturer's claim at the 0.05 significance level. calculate the p-value.