A process control engineer wishes to estimate the true proportion of defective computer chips with a margin of error of no more than 0.05 and with confidence level 97%. How many observations does the engineer need to include in the sample to achieve his goal

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?