Suppose the mean gpa of all students graduating from a particular university in 1975 was 2.30. the registrar plans to look at records of students graduating last year to see if the mean gpa has increased. define notation and state the null and alternative hypotheses for this investigation.

Email viruses are typically launched by people who modify header information to hide their identity. brightmail's enrique salem says that in the future, your email reader will authenticate the sender before putting hte message in your inbox. that way, you will know the source of all the emails you read. alan nugent of novell says, "i'm kind of a fan of eliminating anonymity if that is the price for security." will eliminating anonymity make computers more secure?

Wren pork company uses the value basis of allocating joint costs in its production of pork products. relevant information for the current period follows: product pounds price/lb. loin chops 3,000 $ 5.00 ground 10,000 2.00 ribs 4,000 4.75 bacon 6,000 3.50 the total joint cost for the current period was $43,000. how much of this cost should wren pork allocate to loin chops?

An insurance company estimates the probability of an earthquake in the next year to be 0.0015. the average damage done to a house by an earthquake it estimates to be $90,000. if the company offers earthquake insurance for $150, what is company`s expected value of the policy? hint: think, is it profitable for the insurance company or not? will they gain (positive expected value) or lose (negative expected value)? if the expected value is negative, remember to show "-" sign. no "+" sign needed for the positive expected value