Mathematics, 30.11.2020 17:20, tinalmath
The mean length of a cellular telephone call in 1999 was 2.38 minutes. A researcher claims that the average length of a phone call has increased since then. She conducts a survey of randomly selected 49 cellular phone users and determines the mean length to be 2.48 minutes, and standard deviation 1.8 minutes. To test the claim we would use:
Answers: 2
Mathematics, 21.06.2019 19:00, cassie2021
What are the solutions of the equation? 5z^2 + 9z - 2 = 0 a. 1, -2 b. 1, 2 c. 1/5, -2 d. 1/5, 2
Answers: 2
The mean length of a cellular telephone call in 1999 was 2.38 minutes. A researcher claims that the...
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