Answer:
a
Step-by-step explanation:
Answer:
Step-by-step explanation:
c
Answer:
(27.3692 ; 44.6308)
Step-by-step explanation:
Mean, xbar = 36
Standard deviation, s = 11
Sample size, n = 12
Tcritical at 0.2, df = 12 - 1 = 11 ; Tcritical = 2.718
Confidence interval :
Xbar ± Margin of error
Margin of Error = Tcritical * s/sqrt(n)
Margin of Error = 2.718 * 11/sqrt(12) = 8.6308
Confidence interval :
Lower boundary : 36 - 8.6308 = 27.3692
Upper boundary : 36 + 8.6308 = 44.6308
(27.3692 ; 44.6308)
<span>
<u><em>The correct answer is: </em></u>1000.
<u><em>Explanation</em></u><span>
<u><em>: </em></u>We divide to find the answer to this: </span></span>

<span><span>. When we are dividing by 10, we can move the decimal to the left one place; doing this gives us 1000.</span></span>