Solution :
Given that,
n = 195
x = 162
Point estimate = sample proportion = = x / n = 162 / 195 = 0.831
1 -
= 1 - 0.831 = 0.169
At 95% confidence level
= 1 - 95%
=1 - 0.95 =0.05
/2
= 0.025
Z/2
= Z0.025 = 1.960
Margin of error = E = Z
/ 2 * ((
* (1 -
))
/ n)
= 1.96 (((0.831
* 0.169) / 195)
= 0.0526
A 95% confidence interval for population proportion p is ,
- E < p <
+ E
0.831 - 0.0526 < p < 0.831 + 0.0526
( 0.778 < p < 0.883 )
correct option is = C
1.23 25) 25) Use the given degree of confidence and sample data to construct a confidence...
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