Truck washing service

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Truck washing service

  1. 1. Truck washing service Courtney Matus Kevin O’Hara
  2. 2. TWS: • Provides cleaning service to truckers and trucking operations • Two types of services: Mobile truck washing service and Mobile chemical treating service • Most revenues come from type 1 • Trucks generally cleaned before auctions
  3. 3. “While the cats away, mice will play” • Idea that sales decrease while on vacation • Idea that sales decrease while at class • Idea that sales increase at an auction
  4. 4. Vacation HYPOTHESIS TESTS x-value sample 1 35 x-value sample 2 11 for the proportion proportion 1 76.1% proportion 2 23.9% pooled proportion 0.500 sample size 1 46 sample size 2 46 Vacation 1 Vacation 2 std error 0.104 Do sales decrease when on vacation? NULL: p1 = p2 Sales do not decrease on vacation ALTERNATIVE: p1 < > p2 Sales do decrease on vacation one-tailed or two tailed? 2 enter 1 or 2 above test statistic (obs) 5.00 critical measure 1.96 |obs| > critical?? yes if yes reject null p-value 0.00 a-level 0.050 ←enter alpha level here p-value < a-level?? yes if yes reject null
  5. 5. Class HYPOTHESIS TESTS x-value sample 1 41 x-value sample 2 5 for the proportion proportion 1 89.1% proportion 2 10.9% pooled proportion 0.500 sample size 1 46 sample size 2 46 Class 1 Class 2 std error 0.104 Do sales decrease when one is off to class? NULL: p1 = p2 Sales do not decrease when one is in class ALTERNATIVE: p1 < > p2 Sales do decrease when one is in class one-tailed or two tailed? 2 enter 1 or 2 above test statistic (obs) 7.51 critical measure 1.96 |obs| > critical?? yes if yes reject null p-value 0.00 a-level 0.050 ←enter alpha level here p-value < a-level?? yes if yes reject null
  6. 6. Auction HYPOTHESIS TESTS x-value sample 1 38 x-value sample 2 8 for the proportion proportion 1 82.6% proportion 2 17.4% pooled proportion 0.500 sample size 1 46 sample size 2 46 Auction No auction std error 0.104 Do sales increase during an auction? NULL: p1 = p2 Sales do not increase during an auction ALTERNATIVE: p1 < > p2 Sales do increase during an auction one-tailed or two tailed? 2 enter 1 or 2 above test statistic (obs) 6.26 critical measure 1.96 |obs| > critical?? yes if yes reject null p-value 0.00 a-level 0.050 ←enter alpha level here p-value < a-level?? yes if yes reject null
  7. 7. Recommendations • Vacation- reject the null • Sales do not decrease while on vacation • Class- reject the null o Sales do not decrease while one of the owners is at class • Auction- reject the null o Sales do not increase during an auction.
  8. 8. Thank-you • Any Questions?

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