ISU STAT 226 - STAT226_Exam1 (8 pages)

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STAT226_Exam1



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STAT226_Exam1

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Pages:
8
School:
Iowa State University
Course:
Stat 226 - Intr Busines Stat I

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Name Total 93 1 95 points Class Section 1pt EXAM II STAT 226 Fall 2016 Show all your work and write complete and coherent answers You must show your ISU student ID card or driver s license if asked You should bring to the exam a calculator capable of taking square roots You may not use your cellphone as a calculator You may not share calculators Provide units for numerical answers for quantities that have units e g dollars or thousands of dollars Show all of the steps that you used to get your final answer If you do not show your work you will not get full credit and no partial credit can be given in the case of incorrect answers If you show clearly the steps needed to arrive at a final numerical answer you will receive full credit even if the final calculation is not complete For example Pr Z z 1 0 95 is just as good as Pr Z z 1 0 95 0 05 We strongly recommend the use of a pencil with an eraser rather than a pen Please write as clearly and neatly as possible If I cannot read your answers I cannot give you any credit Feel free to ask for more paper if you need more space Take the time to carefully read all the questions on the exam GOOD LUCK Form B Solution I have neither given nor received any unauthorized aid in completing this exam Signed Total score Exam II Stat 226 FORM B Page 2 1 43pts NYC Taxi PART I The New York City Taxi and Limousine Commission recently released a detailed historical dataset on individual taxi trips in the city A random sample of 40 trips yielded an average amount charged to the customer per trip as 16 18 and a standard deviation of 10 09 Is there sufficient evidence to claim that the average amount charged to the customer per trip for all NYC taxi customers is lower than 15 Test this claim at the significance level 0 05 The following analysis is performed in JMP A 3pts Describe in words what the population mean represents in the context of the problem B 5pts State the corresponding null and alternative hypothesis using proper statistical notation C Calculate the value of the test statistic round to the nearest 2 decimal places Show your work here D The associated degrees of freedom for the t distribution are Exam II Stat 226 FORM B Page 3 E 2pts Based on the information given in the JMP output identify the p value associated with the test statistic in part C p value F 2pts Circle one Based on the above p value make a decision about H0 Use a significance level of 0 05 i ii iii iv Reject the null hypothesis because the p value Reject the null hypothesis because the p value Fail to reject the null hypothesis because the p value Fail to reject the



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