Anational firm reports mean earnings of $75 ± $12 (µ ± σ) per unit sold over the lifetime of the company. a competing company over the past 36 reporting periods had reported mean earnings equal to $78 per unit sold. conduct a one-sample z test to determine whether mean earnings (in dollars per unit) are larger (compared to that reported by the national firm) at a .05 level of significance. 1. state the value of the test statistic and whether to retain or reject the null hypothesis. 2. compute effect size using cohen’s d.

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step-by-step explanation:

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus

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