For the normalcdf function, can you instead of using (say the second example you showed) the 2 z-scores of the 5.5 and 7.5, and keeping mean and standard deviation as 0 and 1, could you just use the 5.5 and 7.5 themselves as bounds, while putting the given mean and standard deviations in the function? If so, how would I note this on an FRQ to show satisfactory processes?
4:50 you mentioned that we dont need to write normCdf on the frq but what if i were to do normCdf(lower=8, upper=9999, mean=6.8, sd=0.7)=0.044? Is it okay if I dont show my z score (and just hit everything in the calculator) and just write 4.4%?
You must likely would be ok, but I tell my students to show work for z-score and what you are using normalcdf to find, for example, P(X > 27) = P(z > 1.24). Do not write normalcdf, you are just using it to get the answer. This is the same with any other calculator command.
You should avoid writing anything down on an FRQ that is calculator based, like writing down normalcdf. Show work for z-score and what you are using normalcdf to find, for example, P(X > 27) = P(z > 1.24). Do not write normalcdf, you are just using it to get the answer. This is the same with any other calculator command.
Since in the problem, you are given that you are to assume that the distribution is normal. Therefore, you use the normal distribution with mean = 0, and SD = 1.
honestly, very well made and helpful, but you are overcomplicating the values you put into the calculator, please look into that, you don't have to find the z scores you can just put the values in as is
For the normalcdf function, can you instead of using (say the second example you showed) the 2 z-scores of the 5.5 and 7.5, and keeping mean and standard deviation as 0 and 1, could you just use the 5.5 and 7.5 themselves as bounds, while putting the given mean and standard deviations in the function? If so, how would I note this on an FRQ to show satisfactory processes?
you could, its just in order to receive credit on the frq portion of the ap test you have to convert them to Z scores and show that calculation
4:50 you mentioned that we dont need to write normCdf on the frq
but what if i were to do normCdf(lower=8, upper=9999, mean=6.8, sd=0.7)=0.044?
Is it okay if I dont show my z score (and just hit everything in the calculator) and just write 4.4%?
I would put the infinity symbol instead of 9999.
That’s also what I want to ask
You must likely would be ok, but I tell my students to show work for z-score and what you are using normalcdf to find, for example, P(X > 27) = P(z > 1.24). Do not write normalcdf, you are just using it to get the answer. This is the same with any other calculator command.
HOW OFTEN ARE YOU HITTING THE GYM
HAhHa. Every day!
@@mporinchak I always wanted to ask that same question
how many decimals should you include in your answers? like is there a rule or should it be at least x amount of decimal places
No official rule. I tell my students 3 sig figs
Do you have to show your work for checking conditions if any of the sampling distribution questions were on an frq ?
No but some questions might ask to describe a sampling distribution and if a condition isn’t met then it will affect the answer
@@mporinchakthank you!
If I label all the calculator stuff correctly. Do I get penalized?
You should avoid writing anything down on an FRQ that is calculator based, like writing down normalcdf. Show work for z-score and what you are using normalcdf to find, for example, P(X > 27) = P(z > 1.24). Do not write normalcdf, you are just using it to get the answer. This is the same with any other calculator command.
I don’t get why you didn’t type in the mean and standard deviation
Since in the problem, you are given that you are to assume that the distribution is normal. Therefore, you use the normal distribution with mean = 0, and SD = 1.
@@deqtec1390 oh ok thanks
🙌
14.05 you find the value 0.00122 and say it right. But then you wrote it as .0122
dang great catch sorry about that mistake!
honestly, very well made and helpful, but you are overcomplicating the values you put into the calculator, please look into that, you don't have to find the z scores you can just put the values in as is