This assignment covers content from Unit 6. It assesses your knowledge of correlational analysis and
regression analysis used to examine the relationship between two quantitative variables.
Show all your work and justify all of your answers and conclusions, except for the True/False
Keep your work to 4 decimals, unless otherwise stated.
Finishing a test of hypotheses with a statement like "reject
" or "do not reject
" will be
insufficient for full marks. You must also provide a written concluding statement in the context of the
problem itself. For example, if you are testing hypotheses about the effectiveness of a medical
treatment, you must conclude with a statement like, "we can conclude that the treatment is effective" or
"we cannot conclude that the treatment is effective."
(43 total marks)
A large warehouse superstore is interested in optimizing its customers' shopping experiences and, as
such, wants to ensure that it is able to staff the store properly during peak hours. The store management
is interested in studying the relationship between the number of tills or checkouts that are open in the
store and the amount of time it takes for a customer to check out (that is, the time it takes from when
they get in line to when they complete their purchase). The data in the following table were collected
from a random sample of 7 customers:
Mathematics 215: Introduction to Statistics