A random sample of the houses in a particular city is select…

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. The decision is to ______________.

% Gold by Weight % Lead by Weight 0.22 0.41 0.24 0.31…

% Gold by Weight % Lead by Weight 0.22 0.41 0.24 0.31 0.20 0.89 0.23 0.62 0.18 0.41 0.15 0.88 0.17 0.67 0.17 0.59 The data above were gathered on 8 coins known to have been produced by a mint in Rome.  Gold and lead have been identified as possible factors in identifying the coins as having been minted in Rome.  If a Roman coin is selected at random, and its gold content is 0.20% by weight, calculate the predicted lead content. 

According to internal testing done by the HardCore Apple Com…

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 standard deviation of the sampling distribution for a sample of size n = 16?