Problem Number One: You work for the zoo which has an exhibit containing 1000 box turtles. Your boss tells you to weigh 250 of these turtles and make an 85% confidence interval for the mean weight of all of the turtles at the zoo. You find that the average weight for the 250 turtles is 13 pounds. Your boss remembers the standard deviation for all box turtles being 1.6 pounds. Make that confidence interval.
Problem Number One: You work for the zoo which has an exhibit containing 1000 box turtles. Your boss tells you to weigh 250 of these turtles and make an 85% confidence interval for the mean weight of all of the turtles at the zoo. You find that the average weight for the 250 turtles is 13 pounds. Your boss remembers the standard deviation for all box turtles being 1.6 pounds. Make that confidence interval.
Problem Number Two: You zoo boss is now upset at the guppy exhibit. There are many many guppies in the exhibit and that number is growing all the time. Your boss asks you to make a 95% confidence interval for the mean length of a guppy. You sample 20 guppies and find that their average length is 2 cm with a standard deviation of .25 cm. Make that confidence interval.
Problem Number Three: Your zoo boss is upset that not enough of the daffodils in the daffodil exhibit are orange. You sample 900 daffodils and find that 90 are orange. Make a 99% confidence interval for the percentage of all daffodils in the exhibit that are orange.
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