a cell phone company claims that the average time a person spends on their phone is 12.8 hours a week. a sample of unknown size of phone users was selected, and the mean time they spent on their phones was 12.2 hours in a week, with a standard deviation of 2.3 hours. using a 90% confidence level, how many people would the company have to sample in order for their hypothesis to be true
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Category: statistics | Author: Ehud Raghnall
a cell phone company dropped the prices on their phone by 9% which expression shows the new price of the phones(p) a. p-0.09p b. p-1.09 c. px0.09 d.
a cell phone company has launched a new cell phone with advanced features. which promotional strategy would be the best for the company? a. deploy emp
a cell phone company has the following cost and revenue functions: c(x) = 8x^2 - 600x + 21,500 and r(x) = -3x^2 + 480x. what is the range of cell phon