Classify the following scenarios as one-sided or two-sided tests.
One-sided hypothesis tests test for either an increase or a decrease, but not both. Two-
sided hypothesis tests test for a change in either direction.
The following are one-sided hypothesis tests:
Test whether children who take a vitamin C supplement are less likely to become
ill during flu season than children who do not
Test whether there has been an increase in the average amount spent per table
since the restaurant changed its head chef
The following are two-sided hypothesis tests:
Test whether there has been a change in average salary at a company since its
merger with another company
Test whether the average number of clicks on a website has changed since the
implementation of a new home page
A sporting goods store manager wants to forecast annual sneaker revenues
based on the type of sport (running, tennis, or walking), color (red, blue, white,
black, or violet) and its target audience (men or women). How many independent
variables should the manager include in her multiple regression analysis?
enter your answer as an integer; that is with no decimal point.