Amarketing student is estimating the average amount of money that students at a large university spent on sporting events last year. he asks a random sample of 50 students at one of the university football games how much they spent on sporting events last year. using this data he computes a 90% confidence interval, which turns out to be ($217, $677). which one of the following conclusions is valid? a. we can be 90% confident that the mean amount of money spent at sporting events last year by all the students at this university is between $217 and $677. b. 90% of the sample said they spent between $217 and $677 at sporting events last year. c. no conclusion can be drawn.

Muscles, a membership-only gym is hoping to open a new branch in a small city in pennsylvania that currently has no fitness centers. according to their research approximately 12,600 residents live within driving distance of the gym. muscles sends out surveys to a sample of 300 randomly selected residents in this area (all of who respond) and finds that 40 residents say they would visit a gym if one was located in their area. based on the past survey research, muscles estimates that approximately 30% of these respondents would actually join the gym if they opened one in the area. based on this information and the results of the sample survey, about how many residents should muscles expect to join its new branch? a) 134 b) 504 c) 1,680 d) 3,780

Select the correct answer from the drop-down menu. subtracting 3xy^2 from 8xy^2 gives the same result as the expression. [tex]3xy ^{2} - 8xy ^{2} [/tex][tex] { - 7xy}^{2} - {2xy}^{2} [/tex][tex] {7xy}^{2} - {2xy}^{2} [/tex]

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species