The effect of the time of day a science class is taught on test scores is being studied in an experiment. Repeating the experiment several times with different teachers or at different times of the year is an example of which experimental design principle? A. Direct Control B. Blocking C. Randomization D. Replication

Write a story that matches with the expression 42x-5 pls hurry

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

An engineer is going to redesign an ejection seat for an airplane. the seat was designed for pilots weighing between 120 lb and 161 lb. the new population of pilots has normally distributed weights with a mean of 125 lb and a standard deviation of 28.1 lb. a)if a pilot is randomly selected, find the probability that his weight is between 120 lb and 161 lb.the probability is approximately? b. if 36 different pilots are randomly selected, find the probability that their mean weight is between 120 lb and 161 lb. the probability is approximately? c. when redesigning the ejection seat, which probability is more relevant? . part (b) because the seat performance for a single pilot is more important. b. part (b) because the seat performance for a sample of pilots is more important. c. part (a) because the seat performance for a sample of pilots is more important. d. part (a) because the seat performance for a single pilot is more important.