Aresearch group interested in understanding the effect of listening to classical music on learning mathematics conducted a study. one hundred students were randomly assigned to one of two groups. the first group listened to classical music as they learned a new lesson. the second group learned the same lesson with no music playing. both groups were tested on the new material to determine how much they learned. the results for the two groups were compared. what kind of study is this?
this is an observational study because students were randomly assigned to groups.
this is an observational study because a treatment was applied to both groups.
this is an experiment because a treatment was applied to a group.
this is an experiment because students were able to choose which group to join.

Which expression is rational? 6. , square root two, square root 14, square root 49

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?

Students at a high school were asked about their favorite outdoor activity. the results are shown in the two-way frequency table below. fishing camping canoeing skiing total boys 36 44 13 25 118 girls 34 37 22 20 113 total 70 81 35 45 231 select all the statements that are true based on the given table. more girls chose camping as their favorite outdoor activity than boys. more girls chose canoeing as their favorite outdoor activity than those who chose skiing. more boys chose skiing as their favorite outdoor activity than girls. there were more boys surveyed than girls. twice as many students chose canoeing as their favorite outdoor activity than those who chose fishing. more students chose camping as their favorite outdoor activity than the combined number of students who chose canoeing or skiing.