#Combining two samples

19 messages · Page 1 of 1 (latest)

severe stag
#

The only part I'm stuck on is iii) in part b). I calculated the E(X) = 13.21, but I have been trying so long to get standard deviation. The answer I had said that standard deviation = 2.4, which does not make sense to me at all. Would it be the answer is wrong? Or am I missing something?

🙏

Screenshot_2024-11-03_at_15.54.42.png
lofty bladeBOT
#
  1. Ask your question and show the work you've done so far. If you've posted a screenshot of a question, specify which part you need help with.
  2. Wait patiently for a helper to come along.
  3. If the Helper has answered your question, remember to thank them with the Mathematics Ranks bot and close the thread with:
    +close
  4. Feel free to nominate the person for helper of the week in #helper-nominations
  5. Do not ping the Moderators, unless someone is breaking the rules. **Do not ping the Helper Moderators, unless there is a conflict between helpers.
  6. If you're happy with the help you got here, and the server overall, you can contribute financially as well:
open jay
#

i think you are to assume that the standard deviation is 2.4

#

it's a bit of a silly question, in truth

severe stag
#

If I am not to assume it is 2.4 (because it doesn't look like it is), how would I calculate the STDEV? unless the STDEV is actually 2.4

open jay
severe stag
#

can we use this formula instead?

Screenshot_2024-11-03_at_16.45.58.png
#

only thing is idk if this counts as independent

open jay
#

this is the full formula, i think

image.png
open jay
violet swift
#

i assume you know how to calculate SEM, right?

open jay
severe stag
severe stag
reef oarBOT
#

@severe stag

<:HelpIcon:1304095958283321385>| Help Reminder

Hello toothpaste3699, this is a friendly reminder that your thread has been open for more than 24 hours. If you no longer need assistance, please consider closing the thread using the +close command.

polar crystal
#

+close