9. A college financial advisor wants to estimate the mean cost of textbooks per quarter for students at the college. For the estimate to be useful, it should have a margin of error of 20 dollars or less. The standard deviation of prices is estimated to be around 100 dollars. How large of a sample size needs to be used to be 95% confident, with the given margin of error?

97

Step-by-step explanation:

Formula to compute the required sample size :

, where = standard deviation

E= Margin of error

= Two tailed z-value.

Here, E= 20

= 100

For 95% confidence level: =1.96

Required sample size:

Hence, the required sample size : 97

unless if u could do my questions, if not i wouldn't want to

3,750 deer

step-by-step explanation:

1,500 is 15 times larger than 100

lets make 250 15 times larger.

3750 deer