Step-by-step explanation:
Mean = 81740
Standard deviation = 4590
Sample size = 15
Alpha level = 1-0.95 = 0.05
Df = 15-1 = 14
Critical value:
alpha/2 = 0.05/2 = 0.05
t0.025
t critical value = 2.145
Margin of error ME
2.145 x 4590/√15
2.145 x 4590/3.873
ME = 2542.09
Confidence interval
Lower CI = mean - ME
= 81740-2542.09
= 79197.91
Upper CI = mean + ME
= 81740+2542.09
= 84282.09
[ 79197.91, 84282.09]
B.
Using excel, exact answer for CI
Lower limit = 79198.142724212173
Upper limit = 84281.8572757827
C.
The assumptions to be made from the population are that
1. Samples are random
2. These samples are gotten from an approximately normal distribution
Answer:
7
Step-by-step explanation:
24(1/4)= 6
6(2/3)= 12/3= 4
The answer is 4. Hope this helps!
Answer:
x > 5
Step-by-step explanation:
0 < x-5. Add 5 to both sides...
+5 +5
5 < x Rearrange answer
x > 5
Answer:
15.6%
Step-by-step explanation:
$52,000 - 45,000 = $7,000
$7,000 ÷ 45,000 = 0.15555555... ≈ 15.6%
