20 22 Do students who ride bicycles really have a lower carbon footprint? A skep
ID: 3259530 • Letter: 2
Question
20 22 Do students who ride bicycles really have a lower carbon footprint? A skeptical stats 23 student set out to investigate this question. Although the students undoubtedly used 24 less fossil fuel to get around, their bike riding led to consumption of more fuel because 25 of their need for extra showers, larger meals, and petroleum based skin tight biking gear. 26 He evaluates a group of car driving students to see what CO2 emissions their driving 27 produces. Here are his results (in Mg emissions/day) 431 324 145 678 456 324 167 435 789 213 389 347 432 234 421 876 543 214 378 325 654 321 364 123 213 29 189 498 30 234 32 He then follows the bikers around and calculates their emissions based on their habits 33 and gathers these results 34 213 371 126 123 213 123 321 156 159 105 378 176 140 192 543 234 244 109 Do the bikers have different emissions from the drivers? State your hypothesis 176 185 173 36 97 178 37 321 104 39 and conclusion. Give a confidence interval for the difference between the 2 groups. 40 What does it tell you? 41 Use an alpha of.05Explanation / Answer
Data :
Result of t-test on excel
Since p-value for 2-tailed test is 0.00001
which is less than 0.05 (level of significance)
hence we reject the null hypothesis
and conclude that there is significant difference between bikers and car drivers .
95% Confidence Interval for the Difference ( 106.491 , 258.509 )
3)we can see that we are 95 % confident that difference between car rider and biker is between 106.5 and 258.5 .
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