n a study of 205 adults, the mean heart rate was 75 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 8 beats per minute. What is the 95% confidence interval for the mean beats per minute?

Question

ganeshie8 · Answer

$\large  CI =    \overline{x}  \pm  Z^* \frac{\sigma}{\sqrt{n}}$

ganeshie8 · Answer

you already knw :
$\overline{x} = 75$
$\sigma = 8$
$n = 205$

ganeshie8 · Answer

you just need to find the $Z^*$ and plugin

ganeshie8 · Answer

knw how to find $Z^*$ for 95% CI ?

anonymous · Answer

It is 73.9 -76.1

anonymous · Answer

Thankyou soooo much @thiamoonshadow you were correct!! (just took the test)