There are 4 classrooms of third grade and 4 of fourth grade at our school. each classroom has 20 students. she knows the following information:
·90% of 3rd and 4th grade students have permission to go on the trip.
·4 teachers are going on the trip
·the school requires 1 parent volunteer for every 8 students going on the trip.

part a: how many parent volunteers are needed to go on the trip?

part b: all of the students, teachers, and parents going on the trip ride in school buses that hold 44 people. how many school buses should mrs. horan reserve?

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10