Author Question: A researcher asked random samples of 50 kindergarten teachers and 50 12th grade teachers how much ... (Read 225 times)

geoffrey · **on:** Jul 24, 2018

A researcher asked random samples of 50 kindergarten teachers and 50 12th grade teachers how much money they spent out-of-pocket on school supplies in the previous school year, to see if teachers at one grade level spend more than the other. A 95 confidence interval for K - 12 is 30 to 50 . Based on this result, it is reasonable to conclude that
a. 95 of all kindergarten and 12th grade teachers spend between 30 and 50 on average.
b. 95 of all kindergarten teachers spend between 30 and 50 more then 95 of all 12th grade teachers.
c. kindergarten teachers spend more on average than do 12th grade teachers.
d. 12th grade teachers spend more on average than do kindergarten teachers.

Question 2

For each study, decide if the two samples are independent samples or paired samples. In an experiment, students taking French are randomly divided into two groups. Half of the students first take a written exam and a week later an oral exam. The other half of the students take the exams in reverse order. The grades of the oral exam were then compared to the grades of the written exam.
a. Independent samples
b. Paired samples