Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoccupied seats per flight over the past year. To accomplish this, the records of 275 flights are randomly selected and the num unoccupied seats is noted for each of the sampled flights. The sample mean is 11.8 seats and the sample standard deviation is 4.3 seats. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) O Part (a) (i) 3," (i) n- (iv) n-1= O Part (b) O Part (c) O Part (d) Construct a 92% confidence interval for the population average number of unoccupied seats per flight. 1) State the confidence interval. (Round your answers to two decimal places.) (i) Sketch the graph. C.L. =l (ii) Calculate the error bound. (Round your answer to two decimal places.) 8|N
Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoccupied seats per flight over the past year. To accomplish this, the records of 275 flights are randomly selected and the num unoccupied seats is noted for each of the sampled flights. The sample mean is 11.8 seats and the sample standard deviation is 4.3 seats. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) O Part (a) (i) 3," (i) n- (iv) n-1= O Part (b) O Part (c) O Part (d) Construct a 92% confidence interval for the population average number of unoccupied seats per flight. 1) State the confidence interval. (Round your answers to two decimal places.) (i) Sketch the graph. C.L. =l (ii) Calculate the error bound. (Round your answer to two decimal places.) 8|N
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Transcribed Image Text:Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoccupied seats per flight over the past year. To accomplish this, the records of 275 flights are randomly selected and the number of
unoccupied seats is noted for each of the sampled flights. The sample mean is 11.8 seats and the sample standard deviation is 4.3 seats.
NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.)
A Part (a)
(i) x=
(i) s =
(ii)
n =
(iv) n- 1=
O Part (b)
O Part (c)
A Part (d)
Construct a 92% confidence interval for the population average number of unoccupied seats per flight.
(i) State the confidence interval. (Round your answers to two decimal places.)
(ii) Sketch the graph.
C.L. =
(iii) Calculate the error bound. (Round your answer to two decimal places.)
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