Concept explainers
Battery life: A battery manufacturer claims that the lifetime of a certain type of battery has a population mean of μ = 40 hours and a standard deviation of σ = 5 hours. Let
a. If the claim is true, what is
b. Based on the answer to part (a), if the claim is true, is a sample mean lifetime of 38.5 hours unusually short?
c. If the sample mean lifetime of the 100 batteries were 38.5 hours, would you find the manufacturer’s claim to be plausible? Explain.
d. If the claim is true, what is
e. Based on the answer to part (d), if the claim is true, is a sample mean lifetime of 39.8 hours unusually short?
f. If the sample mean lifetime of the 100 batteries were 39.8 hours, would you find the manufacturer’s claim to be plausible? Explain.
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Essential Statistics
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill