Question

1. Tell whether the following call for a right-tailed, left-tailed, or two-tailed alternative hypothesis:

   1. A worker is testing whether the strength of a bolt exceeds the industry requirements.

   2. A chef wants to know whether there is a change of opinion on his food after making some minor adjustments to the recipes.

   3. A state official wants to test whether the changes of winning a lottery are less than advertised.

4. A chemist believes a new compound he’s discovered will speed up certain organic processes (think carefully).

Answer 1

1. Since the worker wants to test whether strength of bolt > industry requirement, this is a one sided, right tailed alternative hypothesis

2. A chef wants to know whether there is a change of opinion on his food after making adjustments to the recepies(here direction is not specified) so this is a two tailed alternative hypothesis

3. Changes of winning lottery<than that advertised, so this is a one sided, left tailed alternative hypothesis

4. New compound will speed up certain organic process, so new time taken<old time taken, so this is a one sided left tailed hypothesis.