The level of nitrogen oxides in the exhaust of a particular car model varies with mean 0.8 grams per mile and standard deviation 0.18 grams per mile. (a) What sample size is needed so that the...

Extracted text: The level of nitrogen oxides in the exhaust of a particular car model varies with mean 0.8 grams per mile and standard deviation 0.18 grams per mile. (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ? (b) If a smaller sample is considered, the standard deviation for x would be ."SMALLER","LARGER" or "THE SAME"