Answer:
CI = 21 ± 0.365
Step-by-step explanation:
The confidence interval is:
CI = x ± SE * CV
where x is the sample mean, SE is the standard error, and CV is the critical value (either t score or z score).
Here, x = 21.
The standard error for a sample mean is:
SE = σ / √n
SE = 3.2 / √510
SE = 0.142
The critical value is looked up in a table or found with a calculator. But first, we must find the alpha level and the critical probability.
α = 1 - 0.99 = 0.01
p* = 1 - (α/2) = 1 - (0.01/2) = 0.995
Using a calculator or a z-score table:
P(x<z) = 0.995
z = 2.576
Therefore:
CI = 21 ± 0.142 × 2.576
CI = 21 ± 0.365
Round as needed.
Answer:
x=10
Step-by-step explanation:
Use pythagorean theorem, a^2+b^2=c^2
24^2 + b^2 = 26^2
576 + b = 676
676-576=100
=10
Nonmembers: $10 per hour = 10h
Members: $300 and $4 per hour = 300 + 4h
10h > 300 + 4h
6h > 300
h > 50
You'd need to use it for more than 50 hours.
Answer:
I think:
A),C),and D
Step-by-step explanation:
Using the formula,( h= 138÷46),and using times after that.
Hope this helps! Have a good day/or night!
P.S: Sorry if I'm wrong I tried my best. Best wishes!!!
