A travel association reported the domestic airfare (in dollars) for business travel for the current year and the previous year. Below is a sample of 12 flights with their domestic airfares shown for both years. Current Year Previous Year 345 303 526 463 420 474 216 206 285 275 405 432 635 585 710 650 605 545 517 547 570 508 610 580
A travel association reported the domestic airfare (in dollars) for business travel for the current year and the previous year. Below is a sample of 12 flights with their domestic airfares shown for both years. Current Year Previous Year 345 303 526 463 420 474 216 206 285 275 405 432 635 585 710 650 605 545 517 547 570 508 610 580
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
Related questions
Question
A travel association reported the domestic airfare (in dollars) for business travel for the current year and the previous year. Below is a sample of 12 flights with their domestic airfares shown for both years.
Current Year |
Previous Year |
---|---|
345 | 303 |
526 | 463 |
420 | 474 |
216 | 206 |
285 | 275 |
405 | 432 |
635 | 585 |
710 | 650 |
605 | 545 |
517 | 547 |
570 | 508 |
610 | 580 |
(a)
Formulate the hypotheses and test for a significant increase in the mean domestic airfare for business travel for the one-year period.
a) H0: ?d ≤ 0
Ha: ?d > 0
b) H0: ?d = 0
Ha: ?d ≠ 0
c) H0: ?d < 0
Ha: ?d = 0
d) H0: ?d ≥ 0
Ha: ?d < 0
e) H0: ?d ≠ 0
Ha: ?d = 0
Calculate the test statistic. (Use current year airfare − previous year airfare. Round your answer to three decimal places.)
answer: ______
Calculate the p-value. (Round your answer to four decimal places.)
p-value = answer _______
Using a 0.05 level of significance, what is your conclusion?
a) Do not reject H0. We cannot conclude that there has been a significant increase in the mean domestic airfare for business travel for the one-year period.
b) Reject H0. We can conclude that there has been a significant increase in the mean domestic airfare for business travel for the one-year period.
c) Do not reject H0. We can conclude that there has been a significant increase in the mean domestic airfare for business travel for the one-year period.
d) Reject H0. We cannot conclude that there has been a significant increase in the mean domestic airfare for business travel for the one-year period.
(part b)
What is the sample mean domestic airfare (in dollars) for business travel for each year?
current $ _______
previous $ _______
(part c)
What is the percentage change in mean airfare for the one-year period? (Round your answer to one decimal place.)
answer : ______%
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