Mathematics, 14.02.2020 03:08 sreeytran
A researcher wants to determine whether there is a relationship between age and the number of text messages sent in a given day. In a random sample of 18- to 25-year-old cell phone users, 100 of 125 users sent texts more often than they made phone calls. In a random sample of 26- to 35-year-old cell phone users, 75 of 120 sent texts more often than they made phone calls. What is the margin of error for a 99% confidence interval for the difference between the proportions of cell phone users in these age groups who text more often than they call?
a. 0.0032
b. 0.0569
c. 0.1114
d. 0.1465
e. 0.2864
Answers: 3
Mathematics, 21.06.2019 21:20, naenae6775
Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.
Answers: 2
Mathematics, 21.06.2019 22:00, mosesbrinker
Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point
Answers: 1
A researcher wants to determine whether there is a relationship between age and the number of text m...
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