Mathematics, 21.04.2020 21:50 jeff6284
NeverReady batteries has engineered a newer, longer lasting AAA battery. The company claims this battery has an average life span of 15 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 14.7 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 14.7 hours or less? Is the company's claim reasonable? (Round your probability to four decimal places.)The company's claim is not reasonable because the probability that a sample of 30 batteries would have a lifetime of at most 14.7 hours is about ?
Answers: 2
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The null and alternate hypotheses are: h0: μ1 ≤ μ2 h1: μ1 > μ2 a random sample of 22 items from the first population showed a mean of 113 and a standard deviation of 12. a sample of 16 items for the second population showed a mean of 99 and a standard deviation of 6. use the 0.01 significant level. find the degrees of freedom for unequal variance test. (round down your answer to the nearest whole number.) state the decision rule for 0.010 significance level. (round your answer to 3 decimal places.) compute the value of the test statistic. (round your answer to 3 decimal places.) what is your decision regarding the null hypothesis? use the 0.01 significance level.
Answers: 1
NeverReady batteries has engineered a newer, longer lasting AAA battery. The company claims this bat...
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