NeverReady batteries has engineered a newer, longer lasting AAA battery. The company claims this battery has an average life span of 19 hours with a standard deviation of 0.8 hours. Your statistics class questions this claim. As a class, you randomly select 30 batteries and find that the sample mean life span is 18.6 hours. If the process is working properly, what is the probability of getting a random sample of 30 batteries in which the sample mean lifetime is 18.6 hours or less? Is the company's claim reasonable? (Round your probability to four decimal places.) The company's claim ( is is not) reasonable because the probability that a sample of 30 batteries would have a lifetime of at most 18.6 hours is about________
NeverReady batteries has engineered a newer, longer lasting AAA battery. The company claims this battery has an average life span of 19 hours with a standard deviation of 0.8 hours. Your statistics class questions this claim. As a class, you randomly select 30 batteries and find that the sample
The company's claim ( is is not) reasonable because the probability that a sample of 30 batteries would have a lifetime of at most 18.6 hours is about________
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