According to the empirical (69-95-99.7) rule, if a random variable has a standard normal distribution, then approximately 95% of all values fall between ‑scores of –2 and 2. Use the standard normal table or software to determine the precise positive value of such that 95% of the area under the standard normal density curve is between − and . If you use software, you may find this list of manuals useful. Give the positive value of precise to two decimal places. =

Bill works as a waiter and is keeping track of the tips he ears daily. about how much does bill have to earn in tips on sunday if he wants to average $22 a day? tips by day tips (dollars) monday tuesday wednesday thursday friday saturday $14 $22 $28 $36

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.

Ranck the following in order from least precise to most precise