Answer:
The answer to your question is:
Step-by-step explanation:
Data
B = 70°
c = 14
Process
sin Ф = b / c
b = c sinФ
b = 14 sin 70
b = 14 x 0.94
b = 13.16
cos Ф = a/c
a = c x cos Ф
a = 14 cos 70
a = 14 x 0.34
a = 4.76
C = 90° it is a right angle
A = 180 - 90 - 70
A = 180 - 160
A = 20°
N=25 You just divide 300 and 12 to get 25!
Answer:
a)
here margin of error E = 0.07
for95% CI critical Z = 1.96
estimated proportion=p= 0.5000
required sample size n = p*(1-p)*(z/E)2= 196
b)
here margin of error E = 0.07
for95% CI critical Z = 1.96
estimated proportion=p= 0.8100
required sample size n = p*(1-p)*(z/E)2= 121
c)
d. No, a sample of students at the nearest college is a convenience sample, not a simple random sample. so it is very possible that the results would not be representative of the population of adults.
X3 + 3x2-x-3=0
x2(x+3)-(x+3)=0
(x2-1)(x+3)=0
x2-1=0
(x-1)(x+1)=0
x=1
x=-1
x+3=0
x=-3