A factory is making resistors. A normal batch has a mean resistance of 1000.0 ohms . A particular batch of resistors is sampled . The sample contains 20 resistor. with a sample average of 1004.7 ohms and a sample standered deviation of 11.3 ohms. a) to a 95 % confidence level , does this batch of resistors have different resistance different than normal ? b) to a 95% confidence level, does this batch of resistors have larger resistance than normal? c) to what confedence level does this batch have larger resistance than normal