https://drive.google.com/file/d/1e-fvBNcaVp8UVjNRGvBEJ6OtSy-68cSV/view?usp=sharing

no

we got through the first slide

wait can you back up on the z score

^^

how did you determine the z score?

I still can't figure out how you got the z table

Can we just use the T table to find the confidence intervals? They’re stated at the bottom

Is it ok to use the last column on the t-table to find the multiplier?

Does it always have to be 10%

me too

I used the t-table and got 1.28 as well…so I think you can?

No it depends on the confidence interval

So, "Yes and No" is the technical answer. I think we'll get to the why of the T vs Z table kinda stuff later

wait I am still lost

RIP I did that part wrong sorry group

No worries

how did you decide to use .08?

Definitely easier

80% came from the question. We'll do 95% next.

So you want 80% in the middle. 20% is left to get to 100%. That means on either side of the 80% there is .10 or 10%. You look for the number on the Z table closest to 10 percent to find the multiplier.

Idman is correct.

so if there is 5% left would that mean 2.5% on each side of 95%?

yes

yes

would you be able to go a little slower?

We're gonna do the same thing twice here if that helps

it was really hard to see the figure on the powerpoint once you sent us to breakout rooms

You an hit the magnifying glass to zoom in

can*

can you slow down a little? I cant keep up with writing it out

In the homework when I subtracted P2 from p1 I got a negative number, what do we do in these cases?

id really appreciate it a little slower as well

It comes down to the sentence where you write out the interpretation

It doesn’t matter if its negative or positive, just interpretation

Negative numbers still indicate a "difference," per se

And when you say "when I do the math," would you do the math lol

I got lost after he circled the answer

can you go over that?

how do you enter (+-) into a calculator?

+- means "two numbers"

do a simple A + B, then again with A - B

It just means the positive and the negative of the same number

doesn't require a fancy number. it's a math symbol which means "add AND substract"

Sample Size?

Larger sample size

so you can get a negative percentage but we’re to treat it as an absolute value?

More or less, Yes. BUT only relevant when comparing two sub populations (Dems and GOP, for example)

Because the negative percentage's sign is less important than its magnitude, per se

Can I get reassigned? I was in a group by myself

Me Too

Its a glitch its happened in my other classes

They have to leave and come back

Cant we just use the percentages on the last row of the t table to find the z score?

I did a Z distribution because I'm silly, but I got 8.43-8.56

in the powerpoint you had given 1.96 for T confidence interval for 95%

sorry, I meant the recorded lecture

Why is the multiplier 2.0 instead of 1.98?

Where are you getting the 2

Didn’t you do t/2 in the recorded lecture as well when doing differences? Or z/2 I don’t know which one it is

Thank you!

Thank you!