Question

Response Question

Answer 1

Answer:

The right solution is "3.29, 3.57".

Step-by-step explanation:

Seems that the given problem is incomplete. Below is the attachment of the complete and appropriate query.

The given values are:

Randomly selected adults,

$n = 105$

Mean,

$\bar{x} = 3.42$

Standard deviation,

$s = 0.75$

Now,

At 95% confidence level if given by,

=  $\bar{x} \ \pm \ Z_{\frac{\alpha}{2} }\times \frac{s}{\sqrt{n} }$

On putting the given values, we get

=  $3.42 \ \pm \ Z_{\frac{0.05}{2} }\times \frac{0.75}{\sqrt{105} }$

=  $3.42 \ \pm \ 1.96\times 0.073$

=  $3.42 \ \pm \ 0.143$

=  $3.29, 3.57$