A contractor has 75 feet of safety rail. The foreman is going to install it in such a way that the work area is
divided into two congruent rectangles. The table
represents the total fenced area, a(s), depending on
the length of the shared side, s.
The equation a(s) = 37.55 - 1.582 models the function
represented in the table. Fill in the blank to complete
the restricted domain of the function. D = {0 SSS
s
a(s)
9
216
11
231
13
234
15
225

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