An entrepreneur is considering the purchase of a coin-operated laundry. the current owner claims that over the past 5 years, the mean daily revenue was $675 with a population standard deviation of $75. a sample of 30 days reveals a daily mean revenue of $625. if you were to test the null hypothesis that the daily mean revenue was $675, which test would you use? group of answer choices
a. t test of a population proportion
b. z test of a population mean
c. t test of population mean
d. z test of a population proportion

The answer is B: Z test of a population mean

Step-by-step explanation:

This is the most appropriate test to use. This is because the standard deviation is known from the question as $75 and we are trying to compare a hypothesized mean of $675 from the null hypothesis to a sample mean of $625. Thus the Z test of a population mean is the test required to be used here.

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation: