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. (i) Determine the sample mean of differences x⎯⎯di Determine the sample mean of differences x¯d Enter in decimal form to nearest tenth. (ii) Determine sample standard deviation of differences sd Enter in decimal form to nearest hundredth. Examples of correctly entered answers: 0.01 0.20 0.35 3.00 (iii) Enter the level of significance α used for this interval estimate: Enter in decimal form. Examples of correctly entered answers: 0.01 0.02 0.05 0.10

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The British Department of Transportation studied to see if people avoid driving on Friday the 13^th. They did a traffic count on a Friday and then again on a Friday the 13^th 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 6^th and the 13^th using a 90% level.

(i) Determine the sample mean of differences x⎯⎯di Determine the sample mean of differences x¯d

Enter in decimal form to nearest tenth.

(ii) Determine sample standard deviation of differences s_d

Enter in decimal form to nearest hundredth. Examples of correctly entered answers:

0.01 0.20 0.35 3.00

(iii) Enter the level of significance α used for this interval estimate:

Enter in decimal form. Examples of correctly entered answers: 0.01 0.02 0.05 0.10

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