Consider random samples selected from the population of all female college soccer players in the united states. assume the mean height of female college soccer players in the united states is 69 inches and the standard deviation is 3.6 inches. which do you expect to have less variability (spread): a sampling distribution with sample size n = 102 or a sampling distribution with sample size n = 15? the sampling distribution with sample size n = 15 will have less variability. the sampling distribution with sample size n = 102 will have less variability. both sampling distributions will have the same variability.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?