2 years ago

(03.05 MC)

Mathematics

1 answer:

vagabundo [1.1K]2 years ago

6 0

Answer:

I can not answer for some reason

i am so so sorry i really was trying

Step-by-step explanation:

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The students are selling cookies at a school fair. Sara is selling three chocolate chip cookies for $2.49.

yan [13]

3 chocolate chip cookies - $2.49 .

So 1 chocolate chip cookies costs 2.49/3=$0.83

1 chocolate chip cookie costs $0.83

20 chocolate chip cookies cost 0.83*20=$16.6

Full credits to a Brainley User.

4 0

3 years ago

An independent-measures research study with n = 5 participants in each treatment produces sample variances of 8 and 10, and a 2-

Crazy boy [7]

Cohen's d is given by:

$Cohen's\ d= \frac{mean\ difference}{ \sqrt{ \frac{(n_1-1)s_1^2+(n_2-1)s_2^2}{n_1+n_2-2} } } \\ \\ = \frac{2}{\sqrt{\frac{(5-1)8+(5-1)10}{5+5-2}}} = \frac{2}{ \sqrt{ \frac{32+40}{8} } } = \frac{2}{ \sqrt{9} } \\ \\ =\frac{2}{3}$