(Need help ASAP)The volleyball coach at a large high school wants to estimate the number of times players spike the ball during any given game. She randomly selects 30 games and records the number of spikes. The coach
constructs a 95% confidence interval for the true mean number of spikes players make in a game. Which of
the following would decrease the margin of error?
using a sample of size 15
using a sample of size 25
constructing a 90% confidence interval
constructing a 99% confidence interval

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

To decrease an amount by 16% what single multiplier would you use

Which will form a composite function?