Question

A survey of 77 commercial airline flights of under 2 hours resulted in a sample average late time for a flight of 2.52 minutes. The population standard deviation was 12 minutes. Construct a 95% confidence interval for the average time that a commercial flight of under 2 hours is late. What is the point estimate? What does the interval tell about whether the average flight is late?

Answer #1

A study conducted by an airline showed that a random sample of
120 of its passengers disembarking at Kennedy airport on flights
from Europe took on average 24.15 minutes with a standard deviation
of 3.29 minutes to claim their luggage and get through customs.
a)What can they assert with 95% confidence about the maximum
error, if they use = 24.15 minutes as an estimate of the true
average time if takes one of the passengers disembarking at Kennedy
on a...

Can you solve this question without any error?
Q) An airline quotes a flight time of 2 hours for its flights
from Dallas to Atlanta. Suppose that actual flight times are
uniformly distributed between 2 hours and 2 hours, 20 minutes. a.
Plot the probability density function for flight time in minutes.
b. What is the probability that the flight will be no more than 15
minutes late? c. If the flight costs an average $120 per hour for
the...

A simple random sample of 100 flights of a large airline (call
this airline 1) showed that 64 were on time. A simple random sample
of 100 flights of another large airline (call this airline 2)
showed that 80 were on time. Let p1 and p2 be the proportion of all
flights that are on time for these two airlines.
If the 90% confidence interval for the difference p1 – p2 is
–0.157 ± 0.102. Is there evidence of a...

A simple random sample of 60 items resulted in a sample mean of
77. The population standard deviation is 17.
a. Compute the 95% confidence interval for the population mean
(to 1 decimal).
( , )
b. Assume that the same sample mean was obtained from a sample
of 120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals).
( , )

Sofi is from Mexico and is looking at flights. She wants to
estimate the average cost of a flight to Quer´etaro (where she’s
from) with a 95% confidence interval, with a margin of error of
$26. She assumes that the standard deviation of flight costs is
$45. How many flights should she look at in order to construct the
confidence interval?
a. 12 b. 11 c. 299 d. 300

A
sample of 33 airline passengers found that the average check-in
time is 2.167 minutes. Based on long-term data, the population
standard deviation is known to be 0.48 minutes. Find a 95%
confidence interval for the mean check-in time.

1. A survey of 30 emergency room patients found that the average
waiting time for treatment was 174.3 minutes. Assuming that the
population standard deviation is 46.5 minutes, find the best point
estimate of the population mean. Construct and interpret the 99%
confidence interval of the population mean.

Given an airline that flies between two cities with a quoted
flight time of 2 hours and 10 minutes (130 minutes). Historical
records indicate that the flight time between the two cities varies
from 2 hours (120 minutes) to 2 hours and 20 minutes (140 minutes).
The flight times are uniformly distributed. What is the probability
that the flight will be between 125 minutes and 135 minutes?

An airline records flight delays in and out of Chicago O'Hare
airport for a year. The average delay for these flights is 8.29
minutes with a standard deviation of 4.71 minutes. For a sample of
78 flights, 54% of flights will have an average delay greater than
how many minutes?
Question 3 options:
1) 8.34
2) 8.76
3) 7.82
4) 8.24
5) There is not enough information to determine this.
Question 4 (1 point) A U.S. census bureau pollster noted...

An airline needs an estimate of the average number of passengers
(the mean passenger load) on a newly scheduled flight. If the mean
passenger load on this flight does not exceed 120 passengers in the
first few months of operation, the airline plans to discontinue the
flight. Its experience is that data for the first month of flights
are unreliable, but thereafter the passenger load settles down.
Therefore, the sample mean passenger load is calculated for the
first 20 weekdays...

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