To find the unit rate, divide total miles by number of gallons:
418 miles / 16 gallons = 26.125 miles per gallon
Round the answer as needed.
Since in this case we are
only using the variance of the sample and not the variance of the real population,
therefore we use the t statistic. The formula for the confidence interval is:
<span>CI = X ± t * s / sqrt(n) ---> 1</span>
Where,
X = the sample mean = 84
t = the t score which is
obtained in the standard distribution tables at 95% confidence level
s = sample variance = 12.25
n = number of samples = 49
From the table at 95%
confidence interval and degrees of freedom of 48 (DOF = n -1), the value of t
is around:
t = 1.68
Therefore substituting the
given values to equation 1:
CI = 84 ± 1.68 * 12.25 /
sqrt(49)
CI = 84 ± 2.94
CI = 81.06, 86.94
<span>Therefore at 95% confidence
level, the scores is from 81 to 87.</span>
72 + 12 = 84 stickers
ignore “she put 9 stickers on each page” because the question asked how many stickers she had total not how many on each page
Ｆ（５） ＝ －２ ＊ ５ ＋ １ ＝ －９
ｔｈｅ ｐａｉｒ ｉｓ （５， －９）
[First Year]
$600 • 0.04 • 1 year
600 • 0.04 = 24 • 1 = 24
[Second Year]
$600 • 0.045 • 1 year
600 • 0.045 = 27 • 1 = 27
24 + 27 = $51
I believe this is correct and I hope this helps! :)
