The net increase or decrease in retained earnings for a period is recorded by closing entries.

true or false

One principle of usability testing is that it permeates product development. what does that mean?

Because of the violent nature of the sport, professional american football players are at risk of suffering concussions (or brain injuries) during the violent collisions that occur between players during the game. violent collisions involving hits to the head are particularly risky. suppose the commissioner of the national football league (nfl) institutes a rule requiring players to wear a new, lighter helmet that is designed to reduce head trauma during collisions between players on the field. while the new helmets the probability of a concussion resulting from each individual collision, at the same time the new helmets could also give football players an incentive to play more , which could potentially the amount of violent collisions and thus the number of concussions suffered by nfl players, all else equal.

An information technology analyst believes that they are losing customers on their website who find the checkout and purchase system too complicated. she adds a one-click feature to the website to make it easier, but finds that only about 99% of the customers are using it. she decides to launch an ad awareness campaign to tell customers about the new feature in the hope of increasing the percentage. she doesn't see much of a difference, so she hires a consultant to her. the consultant selects a random sample of recent purchases, tests the hypothesis that the ads produced no change against the alternative that the percent who use the one-click feature is now greater than 99%, and finds a p-value of 0.240.24. what conclusion is appropriate?