If a person is using drugs, but the drug test says they aren't using drugs, what type of test is this?

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

X+ y = 5 ; x - y =3 solve using linear combination

Paul’s car is 18 feet long. he is making a model of his car that is 1/6 the actual size. what is the length of the model?