At Blaine HS, 53% of students are underclassmen. Only 23% of underclassmen attend prom and 71% of all upperclassmen attend prom. Draw a tree diagram to illustrate the possible outcomes and their probabilities.
Then find the probability that a random BHS student attends prom.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.