$\"\"$

The number of sample space is $\"\"$ .

Since $\"\"$ , normal-distribution is used.

The average mean is $\"\"$ .

The standard deviation is $\"\"$ .

The confidence interval is $\"\"$ .

The confidence interval CI for a normal distribution is $\"\"$ .

In a $\"\"$ confidence interval, $\"\"$ of the area lies in each tail.

The corresponding $\"\"$ value is $\"\"$ .

$\"\"$

$\"\"$ .

The confidence interval is $\"\"$ .

$\"\"$

The confidence interval is $\"\"$ .