The true mean is .

Calculating the confidence interval

×

Sample mean, *x* = ?

Sample standard deviation, *s* = ?

Sample size, *n* = 10

Degrees of freedom (df) = *n* - 1 = 9

*t _{ α(2), df} *= ?

Lower Bound:

x – t_{ α(2), df}

*s*

n

= ?

Upper Bound:

x + t_{ α(2), df}

*s*

n

= ?

(Click on variables to replace them with their current values.)

This confidence interval does? include the true mean.

Mean = 34

Standard deviation = 34

Lower bound of confidence interval = 34

Upper bound of confidence interval = 34

This interval 34 include the true mean.