Mathematics, 11.11.2019 18:31 jfox8741
Astudy was conducted in order to estimate ? , the mean number of weekly hours that u. s. adults use computers at home. suppose a random sample of 81 u. s. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be ? = 3.6 hours. based on this information, what would be the point estimate for ) 81(b) 8.5(c) 3.6(d) none of the above. we are 95% confident that the mean number of weekly hours that u. s. adults use computers at home is: (a) between 8.1 and 8.9.(b) between 7.8 and 9.2.(c) between 7.7 and 9.3.(d) between 7.5 and 9.5.(e) between 7.3 and 9.7.which of the following will provide a more informative (i. e., narrower) confidence interval than the one in problem 3? (a) using a sample of size 400 (instead of ) using a sample of size 36 (instead of ) using a different sample of size 81.(d) using a 90% level of confidence (instead of 95%) using a 99% level of confidence (instead of 95%) both (a) and (d) are correct.(g) both (a) and (e) are correct. how large a sample of u. s. adults is needed in order to estimate ? with a 95% confidence interval of length 1.2 hours? (a) 6(b) 12(c) 20(d) 36(e) 144
Answers: 3
Mathematics, 21.06.2019 19:20
Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.
Answers: 3
Mathematics, 21.06.2019 20:30
Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account
Answers: 2
Mathematics, 21.06.2019 20:30
Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible
Answers: 1
Astudy was conducted in order to estimate ? , the mean number of weekly hours that u. s. adults use...
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