Statistics questions

label Statistics
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

Mar 7th, 2015

First, calculate the critical Z-value for the 85% confidence interval:

Z_crit = Norm.inv ( 0.925, 0, 1 ) = 1.44

The standard error for our sample will be given by sigma/sqrt(n) = 9.3/sqrt(397) = 0.467

So, the confidence interval is given by Mean +/- Z_crit x Standard error

= 18.2 +/- 1.44 x 0.467

= 17.5 (lower) and 18.9 (upper)

Mar 7th, 2015

Did you know? You can earn $20 for every friend you invite to Studypool!
Click here to
Refer a Friend
...
Mar 7th, 2015
...
Mar 7th, 2015
Oct 17th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer