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Svetach [21]
3 years ago
14

Find a formula for the nth term of the arithmetic sequence second term -12 common difference is 5

Mathematics
1 answer:
mestny [16]3 years ago
6 0

Answer:

Step-by-step explanation:

Second term = -12; d = 5

First term = -12 - 5 =  -17

nth term = a + (n-1)*d

= -17 + (n-1)*5

= -17 + 5n - 5

= -22 + 5n

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A researcher working in a Human Resources department was interested in gender and sales figures so he conducted a t-test. The me
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Answer:

d = \frac{78.24 -66.25}{\sqrt{\frac{7^2 +7^2}{2}}}= 1.713

For the interpretation we consider a value for d small is is between 0-0.2, medium if is between 0.2-0.8 and large if is higher than 0.8.

And on this case 1.713>0.8 so we have a large effect size

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Step-by-step explanation:

Previous concepts

The Effect size is a "quantitative measure of the magnitude of the experimenter effect. "

The Cohen's d effect size is given by  the following formula:

d = \frac{\bar X_1 -\bar X_2}{\sqrt{\frac{s^2_1 +s^2_2}{2}}}

Solution to the problem

And for this case we can assume:

\bar X_1 =78.24 the mean for females

\bar X_2 =66.25 the mean for males

s_1 = s_2= 7 represent the deviations for both groups

And if we replace we got:

d = \frac{78.24 -66.25}{\sqrt{\frac{7^2 +7^2}{2}}}= 1.713

For the interpretation we consider a value for d small is is between 0-0.2, medium if is between 0.2-0.8 and large if is higher than 0.8.

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