Answer:
Undercoverage
Step-by-step explanation:
using the telephone directory as the source of survey subject could lead to undercoverage because the sole reason for carrying out a survey is to select a sample that represent the whole populace not a sample that represent those that have telephone.
undercoverage will be a constraint because people without a telephone or people with telephone number not on the telephone directory were not observe in the sample frame and could lead to confounding.
The answer is 3 . Each unit = 4 feet. 4 times 4 =16. then , 6 times 16 =96. then 4 times 8 =32 . 96 divided by 32 =3
Answer:
0.00135
Step-by-step explanation:
Given that a textile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms.
H0: µ = 12 against H1: µ < 12
n =4
std error =
Mean difference
Test statistic t = mean diff/std error = -3
p value=0.00135 <0.05 our significance level
So reject H0
There is evidence to prove that mean is less than 12 kg.
Answer:
use formula (x-x^1)=m(y-y^1)
solution:-
(x+2)=2(y+2)
x+2=2y+4
x+2-2y-4=0
x-2y-2=0
answer