Investigation 2: Ezpass on I-66 Continued Transportation engineers determined that to help ease traffic, they would set

[answerhappygod]

Investigation 2: Ezpass on I-66 Continued Transportation
engineers determined that to help ease traffic, they would set up
tolls for solo drivers during rush hour times on Route I-66 inside
the Capital Beltway (I-495). Carpooling drivers with the proper
Ezpass would drive free. The toll program began in December 4,
2017. To test the claim that fewer vehicles would use Route I-66
after the program began, a count of the number of vehicles were
collected from two random samples. Both samples were taken on the
first Monday of each month for an entire year before and after the
toll program was implemented. The data set is called “Number of
Vehicles 2” and we will use 𝛼 = 0.05 in this investigation.
e) Create a frequency histogram overlaid with a Normal curve of
the sample differences and create a horizontal boxplot of the
sample differences. Title and label each graph appropriately and
copy these graphs into your solutions.
f) Provide a one-sentence comment about these graphs that allow
us to continue conducting inference using the t-distribution in
this problem.
g) No matter your answer to part (f), calculate the test
statistic “by hand” and be sure to show your work (please type this
work). Use the rounded values you obtained in part (b). Round the
test statistic to three decimal places.
h) State the degrees of freedom for this test and show how you
calculated the degrees of freedom.
Given Data from Stat Crunch:
January