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2 years ago

20 pts to whoever helps!!

Mathematics

2 answers:

VladimirAG [237]2 years ago

7 0

<h3>Answer: B) 31.348</h3>

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Work Shown:

We will never use the alpha = 0.05 value when computing the test statistic. So we can ignore alpha for this particular problem.

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n = 40 is the sample size.

s = 2.6 is the sample standard deviation

$\sigma$ = sigma = 2.9 is the population standard deviation (ie the claimed standard deviation for all the pay phones)

Test Statistic for chi-square

$\chi^2 = \frac{(n-1)*s^2}{\sigma^2}\\\\\chi^2 = \frac{(40-1)*(2.6)^2}{(2.9)^2}\\\\\chi^2 = \frac{39*6.76}{8.41}\\\\\chi^2 = \frac{263.64}{8.41}\\\\\chi^2 \approx 31.3483947681332\\\\\chi^2 \approx 31.348\\\\$

padilas [110]2 years ago

3 0

The answer is B because—MOMMY I WANT CANDY ok sweetie I’ll give you some but Right now— OR ELSE I WILL TELL DADDY YOU CHEATED ON HIM— okay!! After giving my son candy.. DADDY YOU HOME!! Then he whispered “mom cheating on you” he gasped SWEETHEART I WANT A DIVORCE— but I’m busy helping someone on Brainly NOT NOW!!

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