for some reason every time i try and get the less than I keep winding up with 1.00000 or 0.00000. no clue why. I follow every step. here is an example of my homework. If you could let help me out I would greatly appreciate it. Also yes I square rooted the variance and got the STD for .5500. Ex. The cost of 5 gallons of ice cream has a variance of 49 with a mean of 29 dollars during the summer. What is the probability of the sample mean would differ from the true mean by less than 1.6 dollars if a sample of 162 5-gallon pails is randomly selected?
Scott McDaniel O ok so when it says would differ you don't have to use the infiniti? ok so for instants if its more than do i still use the same set up in the calculator or would i put the greater than first?
Yes. When it says differs from the mean, we are wanting to know the area between two values. If it just says "more than" or "less than," you have to use the infinity (1E99 or -1E99).
Scott McDaniel ok i see what you mean. Thank you! that has helped a ton. I feel like I just got this all down faster than I did spending 4 hours at the stats tutoring center
If not using calculus, you would need to convert the values to z-scores and look them up in a normal table. I don't really teach with tables any more, but I am sure that there are some helpful videos with z-scores here. It is pretty easy if you have the table. I will make one for you later this week if you cannot find one.
almost 10 years later and still helpful thanks
This just saved my life. Couldn't find this in any of the videos my instructor posted, so thank you!
Just wanted to say thanks, very clear cut instructions.
Wow, its crazy how much you could help someone with a short video. Thank you!! Thanks from California
Thank you so much was having such a hard time understanding!!! You ROCK!!!
Charlotte Dekerlegand
Thank you. Helped me by following step by step.
Thank you for posting a video. My professor never explains why, we have to do certain steps. This explanation was much clearer for my understanding.
Thank you very much! This video is very helpful. I understand better when I see this video.
you truly are a lifesaver. thank you so much. not all angels wear wings, some teach us statistics.
Thank you so much. You are a life saver!!!
THANK YOU!!!!
I am not able to see what is on the calculator when doing the last question. What did you enter in the normal cdf?
OMG, Thank you so much! The textbook didn't make any sense to me.
why didn't you subtract from 1 in part c?
thank you!
Thank u for sharing this video! It helped me alot ☺
THANK YOU!
How does a distribution of values differ from a sampling distribution?
This video was very helpful, however, I was unable to see you solve the last problem on the calculator starting at 7:18
for some reason every time i try and get the less than I keep winding up with 1.00000 or 0.00000. no clue why. I follow every step. here is an example of my homework. If you could let help me out I would greatly appreciate it. Also yes I square rooted the variance and got the STD for .5500.
Ex. The cost of 5 gallons of ice cream has a variance of 49 with a mean of 29 dollars during the summer. What is the probability of the sample mean would differ from the true mean by less than 1.6 dollars if a sample of 162 5-gallon pails is randomly selected?
Always draw and label the normal curve. Then, on the TI, the syntax would be normcdf(27.4,30.6,29,7/sqrt(162)). Does this make sense?
Scott McDaniel O ok so when it says would differ you don't have to use the infiniti? ok so for instants if its more than do i still use the same set up in the calculator or would i put the greater than first?
Yes. When it says differs from the mean, we are wanting to know the area between two values. If it just says "more than" or "less than," you have to use the infinity (1E99 or -1E99).
Scott McDaniel
ok i see what you mean. Thank you! that has helped a ton. I feel like I just got this all down faster than I did spending 4 hours at the stats tutoring center
What is Xmod's distribution?
Wow. the unit normal table is in the TI calculator?! Why isn't my prof telling me this?!
How do you calculate it without a calculator
If not using calculus, you would need to convert the values to z-scores and look them up in a normal table. I don't really teach with tables any more, but I am sure that there are some helpful videos with z-scores here. It is pretty easy if you have the table. I will make one for you later this week if you cannot find one.
Scott McDaniel Ok, thanks
why did you use 36?
The sample size, n, is 36.