To determine the average number of hours of sleep of Algebra students, two confidence interval estimates were created using the SAME sample data: (6.53, 7.95) and (6.20, 8.28). One estimate is at the 90 percent level, and the other is at the 98 percent level. If both intervals were correctly calculated, which is which? A. (6.53, 7.95) is the 90 percent level.
B. (6.53, 7.95) is the 98 percent level.
C. This question cannot be answered without knowing the sample size.
D. This question cannot be answered without knowing the sample standard deviation.
E. This question cannot be answered without knowing both the sample size and standard deviation.

Astudent is determining the influence of different types of food on the growth rate of spiders. she feeds one group of spiders two caterpillars twice a week. the other group received similarly-sized beetles twice a week. she records the amount of time required for individuals to reach sexual maturity. her hypothesis is that the spiders feeding on caterpillars will have a faster growth rate because caterpillars have a higher protein content compared to beetles. in this experiment, what is the dependent variable? spiders assigned to different feeding groups. time required to reach sexual maturity number of prey items fed twice a week. growth rates of each group.