Mathematics, 08.11.2019 04:31 Porciabeauty6788

An article in the national geographic news ("u. s. racking up huge sleep debt," february 24, 2005) argues that americans are increasingly skimping on their sleep. a researcher in a small midwestern town wants to estimate the mean weekday sleep time of its adult residents. he takes a random sample of 80 adult residents and records their weekday mean sleep time as 6.4 hours. assume that the population standard deviation is fairly stable at 1.8 hours. use table 1.

a.
calculate a 95% confidence interval for the population mean weekday sleep time of all adult residents of this midwestern town. (round intermediate calculations to 4 decimal places, "z" value and final answers to 2 decimal places.)

confidence interval to

b.
can we conclude with 95% confidence that the mean sleep time of all adult residents in this midwestern town is not 7 hours?

yes, since the confidence interval contains the value 7.
yes, since the confidence interval does not contain the value 7.
no, since the confidence interval contains the value 7.
no, since the confidence interval does not contain the value 7.

Answers: 3

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 14:30, gwynolegario

The first five terms of a linear sequence are given below. 7 , 12 , 17, 22 , 27 , what is the next term of the sequence?

Answers: 1

continue

Mathematics, 21.06.2019 17:30, Maaaryyss

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

Answers: 2

continue

Mathematics, 21.06.2019 21:20, pampam49

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Answers: 2

continue

Mathematics, 21.06.2019 21:40, joeykyle05

Write the contrapositive of the conditional statement. determine whether the contrapositive is true or false. if it is false, find a counterexample. a converse statement is formed by exchanging the hypothesis and conclusion of the conditional. a) a non-converse statement is not formed by exchanging the hypothesis and conclusion of the conditional. true b) a statement not formed by exchanging the hypothesis and conclusion of the conditional is a converse statement. false; an inverse statement is not formed by exchanging the hypothesis and conclusion of the conditional. c) a non-converse statement is formed by exchanging the hypothesis and conclusion of the conditional. false; an inverse statement is formed by negating both the hypothesis and conclusion of the conditional. d) a statement not formed by exchanging the hypothesis and conclusion of the conditional is not a converse statement. true

Answers: 1

continue

You know the right answer?

An article in the national geographic news ("u. s. racking up huge sleep debt," february 24, 2005) a...