Four research teams each used a different method to collect data on how fast a new iron skillet rusts. assume that they all agree on the sample size and the sample mean (in minutes). use the (confidence level; confidence interval) pairs below to select the team that has the smallest sample standard deviation.
a. confidence level: 95% ; confidence interval: 40 to 50
b. confidence level: 99.7% ; confidence interval: 42 to 48
c. confidence level: 95% ; confidence interval: 35 to 55
d. confidence level: 68% ; confidence interval: 44.5 to 45.5

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?