Answer:
Step-by-step explanation:
Let x be the wait times before a call is answered in phone calls.
The claim is x bar <3.3 minutes
Sample size n =62
Sample mean - x bar = 3.24 minutes
Population std dev =
Since population std dev is known and also sample size is sufficiently large, we can use Z test.
(one tailed test)
Mean difference = 3.24-3.3 = -0.06 min
Std error of sample =
Z = tset statistic = 
p value = 0.119
Since p value > alpha, we accept null hypothesis.
There is no evidence to support the claim at alpha = 0.08
Answer:
? We don't see any graphs to choose from
Step-by-step explanation:
Graph a dotted line (to show it's not included) with y-intercept 1 and slope 1/2. Test the origin (0, 0) in the inequality:
This is true, so shade the side of the line that the origin is on (above the line).
Next inequality...
Graph a solid line with y=intercept 1 and slope 1. Test the origin.
True! Shade the side of the line the origin is on (below the line). See image2, attached.
Graph a dotted line with y-intercept -1 and slope -2. Test the origin (0, 0).
True, so shade the side the origin is on (above the line).
The solutions are located where all the shadings intersect. See image3. The solutions are above the red line, above the green line and below the blue line.
Answer:
(c) Minimum value is -16.
Step-by-step explanation:
This will have a minimum value because the leading coefficient is positive.
We can find the minimum value by converting the function to vertex form:
f(x) = x^2 + 4x - 12
f(x) = (x + 2)^2 - 4 - 12
f(x) = (x + 2)^2 - 16.
The minimum value is -16.
So when you draw the graph the turning point is at (-2, -16).
