The British Department of Transportation studied to see if people avoid driving on Friday the 13th. They did a traffic count on a Friday and then again on a Friday the 13th at the same two locations ("Friday the 13th,"
Q4B
The British Department of Transportation studied to see if people avoid driving on Friday the 13th. They did a traffic count on a Friday and then again on a Friday the 13th at the same two locations ("Friday the 13th," 2013). The data for each location on the two different dates is in following table:
Table: Traffic Count
|
Dates |
6th |
13th |
|
1990, July |
139246 |
138548 |
|
1990, July |
134012 |
132908 |
|
1991, September |
137055 |
136018 |
|
1991, September |
133732 |
131843 |
|
1991, December |
123552 |
121641 |
|
1991, December |
121139 |
118723 |
|
1992, March |
128293 |
125532 |
|
1992, March |
124631 |
120249 |
|
1992, November |
124609 |
122770 |
|
1992, November |
117584 |
117263 |
Let μ1 = mean traffic count on Friday the 6th. Let μ2 = mean traffic count on Friday the 13th. Estimate the mean difference in traffic count between the 6th and the 13th using a 90% level.
(iv) Determine degrees of freedom for the sample of differences dfd :
Enter value in integer form. Examples of correctly entered answers:
2 5 9 23 77
(v) Determine t - score associated with critical value: tc
Enter in decimal form to nearest thousandth. Examples of correctly entered answers:
0.0011 0.020 0.500 0.371 2.000
(vi) Determine "error bound of the mean of difference" E
Enter value in decimal form rounded to nearest tenth. Examples of correctly entered answers:
2.0 0.3 1.6 11.7
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