Suppose we wish to test the hypotheses: H(o): u=15 H(1): u does not = 15 where we know that σ^2 = 9.0. If the true mean is 20, what sample size must you choose to ensure that the probability of Type II error is no greater than 0.1?

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers