A marketing firm claims that its ad campaign will increase sales for a fast-food chain by
15%. In a random sample of 25 stores, the average increase in sales was 16% with a
standard deviation of 5%.
What is the z value for the this example rounded to the nearest hundredth?

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

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step-by-step explanation: