Please help me c: I will give you a shiny shiny medal! : It deals with statistics.
In 2002, the median pH level of the rain in a national park was 5.20. A biologist thinks that the acidity of rain has decreased since then. (This would mean that the pH level of the rain has increased.) She obtains a random sample of 19 rain dates in 2008 and obtains the accompanying data. Determine the P-value of the hypothesis test performed in the statement.

Question

Please help me c: I will give you a shiny shiny medal! :>  It deals with statistics.
In​ 2002, the median pH level of the rain in a national park was 5.20. A biologist thinks that the acidity of rain has decreased since then.​ (This would mean that the pH level of the rain has​ increased.) She obtains a random sample of 19 rain dates in 2008 and obtains the accompanying data. Determine the​ P-value of the hypothesis test performed in the statement.

lacris · Answer

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lacris · Answer

I thought the n would be 19,  and the k = 14

lacris · Answer

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lacris · Answer

@jhonyy9 I hope you have time to spare c:

lacris · Answer

This is the data from least to greatest :)

lacris · Answer

Is the highlighted section a part of the minus section?

lacris · Answer

attachment

lacris · Answer

@jim_thompson5910 I hope you have time to help :>

lacris · Answer

I dont know I have to use the binomial cdf n =20, 
(20, 0.5) however for the k, I'm not sure what to choose and why.

iyuko · Answer

tew erly for this

iyuko · Answer

smh.

lacris · Answer

Ahh, do you think you can help me?

iyuko · Answer

u'll have tew catch me monday

iyuko · Answer

Im so burned out. srry.

lacris · Answer

Aww, okay, do you know anyone else who can?

iyuko · Answer

@518nad @Jaynator495 @Jamierox4ev3r

lacris · Answer

@jim_thompson5910  :>

lacris · Answer

Thank you iYuko :>

jim_thompson5910 · Answer

why not use a tcdf?

lacris · Answer

oh, in my class my teacher taught us to use binomcdf. But there is a way to use tcdf as well?

jim_thompson5910 · Answer

I'm not sure why you're using a binomial

jim_thompson5910 · Answer

binomials are only used for bernouli trials (aka trials with only two outcomes, eg, "yes or no" type of questions) http://www.mathwords.com/b/bernoulli_trials.htm

lacris · Answer

Oh wow! I didn't know that, on our notes that our teacher gave, it says P-value = binomcdf (n,0.5,k).. for two tailed, left tail, and right tail :O I didn't know that, so I would use tcdf instead now?

jim_thompson5910 · Answer

it's possible those notes applied to a different earlier problem

jim_thompson5910 · Answer

you're using a student T distribution because n = 19 is smaller than 30

sigma is not known or given

jim_thompson5910 · Answer

btw this is just a simple t-test that your teacher wants you to do

lacris · Answer

ahh so it would be, tcdf , 19, 0.5, and 5?

jim_thompson5910 · Answer

df = n-1
df = 19-1
df = 18

jim_thompson5910 · Answer

you'll need a t test statistic

lacris · Answer

|dw:1480746432837:dw|so I will have to plug in for this?