A placebo is identical in appearance to the treatment of interest, but contains no active ingredients.

A random sample of the houses in a particular city is selected and the level of random gas is measured for each house in the sample.  The values collected are given below in parts per million (ppm).  Experience has shown that random gas level is approximately normally distributed for this population.  4, 8, 13, 6, 7, 3, 9, 8, 11, 8 Using the above data, perform an hypothesis test on the claim that the average random gas level is 6 ppm. Calculate the P-value.

In a survey of airline travelers, subjects were observed in coach sections of airplanes to determine if men or women are more bothered by a seatmate of the opposite gender using the common armrest.  The table below contains data gathered in that study.   Bothered     Not Bothered     Females     19 26 Males 38 18   What is the probability that a randomly selected passenger is a male who is bothered?

According to internal testing done by the HardCore Apple Company, the mean firmness of their apples, as measured on the Mohs hardness scale is 7.0 with a standard deviation of 0.3.  What is the mean of the sampling distribution for a sample of size n = 16?

A histogram that is positively skewed

Which of the following variables is a categorical variable?

Which of the following is not a property of r ?

One is false about semi conserves in oil, 

The empirical rule states that roughly 95% of the observations fall within ___________ standard deviations of the mean. 

If the “Neanderthal crop” theory was true, how old would agriculture be?