




Card 12 / 21:
Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its mean number of unoccupied seats per flight over the past year. To accomplish this, the records of 225 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The sample mean is 11.6 seats and the sample standard deviation is 4.1 seats.
x ¯ = __________ s x = __________ n = __________ n 1 = __________Define the random variables X and X ¯ in words.Which distribution should you use for this problem? Explain your choice.Construct a 92% confidence interval for the population mean number of unoccupied seats per flight. State the confidence interval. Sketch the graph. Calculate the error bound.

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Questions & Answers
Frequency is the number of all object which is comes from population or sample size
Faiqa
number of all objects?
Amir
frequency is the rate of occurrence of an object
Leek
Explain nominal and ordinal variables
Oyinlola
nominal variables are those variable which is used to “name,” a series of values.
Amir
while ordinal scales provide good information about the order of choices,for example in a customer satisfaction survey.
Amir
what is the difference between Mean and Varience?
Amir
Sum of total object, divided by number of object is called mean
Faiqa
faiqa U didn't clear me.Sorry
Amir
what is df in statistics
Oyinlola
Acquits the accused when in fact,he is ennocent
statistics is a mathematical sciences which deals with collection,presentation and analysis the numerical data
CH
statistics is a tools who convert data into information
CH
method of collection of data
problems of find mean and standard deviation with drawing curve
describe the methods of calculation of sample
what are the various uses of statistics in education
Survey, Public allocation of federal funds, business analysis and consumer data, the lotto, government programs and special services.
Willard
dicuss probability sampling
Rosy
given that a sample is normally distributed with M=10 sd=8 determine
Rosy
disscuss probability sampling
Rosy
Discuss probability sampling
Rosy
Probability sampling is based on the fact that every member of a population has a known and equal chance of being selected. For example, if you had a population of 100 people, each person would have odds of 1 out of 100 of being chosen. With nonprobability sampling, those odds are not equal.
Willard
The Arithmetic Mean is the average of the numbers: a calculated "central" value of a set of numbers.
To calculate it:
• add up all the numbers,
• then divide by how many numbers there are.
Example: what is the mean of 2, 7 and 9?
Add the numbers: 2 + 7 + 9 = 18
Divide by how many numbers, 3
you
Willard
guidelines of designing a table
Anuradha
you can find that information on this website there is a lot of information. It's about interpreting what the concept of information & data you are getting from the graph and understanding how to read the graph and analyze the information. ***understandinggraphics.com/design/datatabledesign/
Willard
find X and Y so that the ordered data set has a mean of 38 and median of 35
17, 22, 26, 29, 34, X, 42, 67 , 70, Y
Mohamed
Write short notes on, nominal variable, ordinal variable, internal variable, ratio variable.
olusola
P( /x50/ less than or equal to 5 ) where mean =52 and Variance =25
please what is data mining
the exploration and analysis of large data to discover meaningful patterns and rules
Hussein
how do we calculate the median
f(x)=cx(1x)^4 as x range 4rm 0<=x<=1. Can someone pls help me find d constant C. By integration only..
Source:
OpenStax, Introductory statistics. OpenStax CNX. May 06, 2016 Download for free at http://legacy.cnx.org/content/col11562/1.18
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