Mathematics, 30.03.2021 01:00, littlecedrick2908
A battery manufacturer claims that the lifetime of a certain type of battery has a population mean of 40 hours and a standard deviation of 5 hours. Let represent the mean lifetime of the batteries in a simple random sample of size 100.
a. If the claim is true, what is P( ≤ 36.7) ?
b. Based on the answer to part (a), if the claim is true, is a sample mean lifetime of 36.7 hours unusually short?
c. If the sample mean lifetime of the 100 batteries were 36.7 hours, would you find the manufacturer's claim to be plausible? Explain.
d. If the claim is true, what is P( ≤ 39.8)?
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.
Answers: 1
Mathematics, 21.06.2019 21:40, dededese2403
Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0
Answers: 1
Mathematics, 21.06.2019 22:00, arrissa1234hinkle
Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.
Answers: 1
A battery manufacturer claims that the lifetime of a certain type of battery has a population mean o...
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