A snowmobile company makes an average of 9 engines/day, with engine average output = 10 horsepower (hp) based on historical record. No other information is available such as population standard deviation. A check of the company records indicated that over the last week, 50 engines were made, with an average of 10 hp and population standard deviations = 3.

Is the variability of the 10 engines made on Monday (with sample average = 12 hp and sample standard deviation = 4.0) significantly different from last week's engine Standard deviation (s =3) of 50 engines?