question16

Il 16 4 Q A researcher asked random samples of 50 12th grade teachers and 50 kindergarten 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% condence interval for difference in the population means (12th grade minus kindergarten) is $30 to $50. Based on this result, it is reasonable to conclude that O 95% of all 12th grade teachers spend between $30 and $50 more then 95% of all kindergarten teachers. 0 Kindergarten teachers spend more on average than 12th grade teachers do, at 95% condence. 0 12th grade teachers spend more on average than kindergarten teachers do, at 95% condence. 0 95% of all kindergarten and 12th grade teachers spend between $30 and $50 on average