Assume that local average signal strength field measurements were made inside a building, and post processing revealed that the measured data fit a distance-dependent mean power law model having a log-normal distribution about the mean. Assume the mean power law was found to be Pr(d) ∝ d-3. If a signal of 1 mW was received at d0 = 1 m from the transmitter, and at a distance of 10 m, 10% of the measurements were stronger than –25 dBm, define the standard deviation, σ, for the path loss model at d = 10m.

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Which of the following best describes the figure?

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10