Answer:
(0.0706, 0.1294)
Step-by-step explanation:
Confidence interval of a proportion is:
CI = p ± CV × SE
where p is the proportion,
CV is the critical value (z score or t score),
and SE is the standard error.
The sample is large enough to estimate as normal. For 95% confidence level, CV = z = 1.96.
Standard error for a proportion is:
SE = √(pq/n)
SE = √(0.1 × 0.9 / 400)
SE = 0.015
The confidence interval is:
CI = 0.1 ± (1.96)(0.015)
CI = (0.0706, 0.1294)
Round as needed.
Answer: it’s A. 19.5
Step-by-step explanation:
SJSISOWLSKSLLSBXJSWOOWKSKDKWLALSMSNDNSKS
Answer:
XW = 4 units
Step-by-step explanation:
Given tanf° = 
, then
tanf° = 
= 
= 
= ( cross- multiply )
2XW = 8 ( divide both sides by 2 )
XW = 4
