Answer:
A. Increase sample size
Step-by-step explanation:
From the formula for estimating the confidence level interval for the mean:
X - Z × s/sqrt n where; X = sample mean; Z = z value corresponding to 95%;
s = standard deviation and n = sample size
It is evident from the equation that the confidence interval for the mean is inversely proportional to the sample size (n), hence increasing the sample size will result in a reduced interval width.
Ok so do you have any idea how to start
Answ
Step-by-step explanation:
10x + 3y = 19
y = 2x + 5
Putting y in the first equation
10x + 3.(2x + 5) = 19
10x + 6x + 15 = 19
16x = 19 - 15
16x = 4
x = 4/16
x = 1/4
Now x in y
y = 2x + 5
y = 2.1/4 + 5
y = 2/4 + 5
y = 1/2 + 5
y = 11/2
1) 0.5^3+0.3^3=
0.5^3=0.125
0.3^3=0.027
0.125+0.027=0.152
2)Let X be the number:
X*7=6*50
7X=300
X=42.857
3) If it takes 3 identical pumps to fill a pool, one pump will take 8*3=24 hours to fill the pool. If you have 4 pumps, it will quadrupal the speed, making it take 24/4=6 hours.
Hope I helped!
