Suppose that a committee is studying whether or not there is waste of time in our judicial system. it is interested in the mean amount of time individuals waste at the courthouse waiting to be called for jury duty. the committee randomly surveyed 81 people who recently served as jurors. the sample mean wait time was eight hours with a sample standard deviation of four hours.
a.
i. x¯= 8
ii. sx = 4
iii. n = 81
iv. n – 1 = 80

b. define the random variables x and x¯in words. x is amount of time individuals waste at the courthouse waiting to be called for jury duty. x- is mean amount of time that sample of 81 people who recently served at jurors.
c. which distribution should you use for this problem? explain your choice.
d. construct a 95% confidence interval for the population mean time wasted.
i. state the confidence interval.
ii. sketch the graph.
iii. calculate the error bound.
e. explain in a complete sentence what the confidence interval means.

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.

answer: yes, since the line has a steeper rate of change than the exponential the y-values will be greater and they will only intersect one time.

27 + 13x + 15 = (x + 5)( =

step-by-step explanation:

27 + 13x + 15 = (x + 5)( = 27 + 13x + 15 = (x + 5)( = 27 + 13x + 15 = (x + 5)( =