




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
bias came in sampling due to
how do you find z if you only know the area of .0808
construct a frequency distribution
Sana
How to take a random sample of 30 observations
you can use the random function to generate 30 numbers or observation
smita
How we can calculate chisquare if observed x٫y٫z/frequency 40,30,20 Total/90
calculate chisquare if observed x,y,z frequency 40,30,20total 90
Insha
find t value,if boysN1, ،32,M1,87.43 S1square,39.40.GirlsN2,34,M2,82.58S2square,40.80
Determine whether the results are significant or insignificant
Insha
The heights of a random sample of 100 entering HRM Freshman of a certain college is 157 cm with a standard deviation of 8cm. test the data against the claim that the overall height of all entering HRM students is 160 cm. previous studies showed that
complete the question..
as data given N = 100,mean= 157 cm, std dev = 8 cm..
smita
the power of the test is
Ejaz
find the mean of 25,26,23,25,45,45,58,58,50,25
add all n divide by 10 i.e 38
smita
1 . The “average increase” for all NASDAQ stocks is the:
STATISTICS IN PRACTICE:
This is a group assignment that seeks to reveal students understanding of statistics in general and it’s practical usefulness. The following are the guidelines;
1. Each group has to identify a natural process or activity and gather data about/from the process.
2.
The diameter of an electric cable,say, X is assumed to be continoues random variable with p.d.f f(x)=6x(1x); ≤x≤1 a)check that f(X) is p.d.f b) determine a number b such that p(Xb)
A manufacturer estimate 3% of his output is defective. Find the probability that in a sample of 10 items
(a) less than two will be defective
(b) more than two will be defective.
A manufacturer estimates that 3% of his output of a small item is defective. Find the probabilities that in a sample of 10 items (a) less than two and (b) more than two items will be defective.
ISAIAH
use binomial distribution with parameter n=10, p= 0.03, q=0.97
Shivprasad
the standard deviation of a symmetrical distribution is 7.8 . what must be the value of forth moment about the mean in order that distribution be
a) leptokurtic
b) mesokurtic
c) platy kyrtic
intrept the obtain value of a b and c
A researcher observed that four out of every ten of their products are
normally defective. A total of 360 samples of the products were being
tested. If the sample is normally distributed and 220 of the products
were identified to be faulty, test the hypothesis that the observation of
the res
please answer the ques"following values are obtained from life table T15=3,493,601 and e°15=44.6 then expected number of person alive at exact age 15 will be "
vinay
how x minus x bar is equal to zero
When the mean (X bar) of the sample and the datapointincontext (X) from the same sample are the same, then it (X minus X bar) is equal to 0
Johns
e.g. mean of. sample is 3 and one of the datapoints in that sample is also 3
Johns
a numerical value used as a summary measure for a sample such as a sample mean is known as
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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