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
Mathematics, 22.06.2019 01:30
Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?
Answers: 1
Mathematics, 22.06.2019 01:30
Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.
Answers: 2
An article in the national geographic news ("u. s. racking up huge sleep debt," february 24, 2005) a...
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