Several years ago, 38% of parents who had children in grades k-12 were satisfied with the quality of education the students receive. a recent poll asked 1 comma 205 parents who have children in grades k-12 if they were satisfied with the quality of education the students receive. of the 1 comma 205 surveyed, 464 indicated that they were satisfied. construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed.

Wo firms, a and b, each currently dump 50 tons of chemicals into the local river. the government has decided to reduce the pollution and from now on will require a pollution permit for each ton of pollution dumped into the river. it costs firm a $100 for each ton of pollution that it eliminates before it reaches the river, and it costs firm b $50 for each ton of pollution that it eliminates before it reaches the river. the government gives each firm 20 pollution permits. government officials are not sure whether to allow the firms to buy or sell the pollution permits to each other. what is the total cost of reducing pollution if firms are not allowed to buy and sell pollution permits from each other? what is the total cost of reducing pollution if the firms are allowed to buy and sell permits from each other? a. $3,000; $1,500 b. $4,500; $3,500 c. $4,500; $4,000 d. $4,500; $2,500