MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A pathologist has been studying the frequency of bacterial colonies within the field of a microscope using samples of throat cultures from healthy adults. Long-term history indicates that there is an average of 2.98 bacteria colonies per field. Let r be a random variable that represents the number of bacteria colonies per field. Let O represent the number of observed bacteria colonies per field for throat cultures from healthy adults. A random sample of 100 healthy adults gave the following information.

r 0 1 2 3 4 5 or more
O 13 13 27 18 21 8
(a) The pathologist wants to use a Poisson distribution to represent the probability of r, the number of bacteria colonies per field. The Poisson distribution is given below.
P(r) = 
e−??r
r!
Here ? = 2.98 is the average number of bacteria colonies per field. Compute P(r) for r = 0, 1, 2, 3, 4, and 5 or more. (Round your answers to three decimal places.)
P(0)
P(1)
P(2)
P(3)
P(4)
P(5 or more)

Compute the expected number of colonies E = 100P(r) for r = 0, 1, 2, 3, 4, and 5 or more. (Round your answers to one decimal place.)

E(0)
E(1)
E(2)
E(3)
E(4)
E(5 or more)

Compute the sample statistic 

?2 = 
 
(O − E)2
E
 
 

 and the degrees of freedom. (Round your test statistic to three decimal places.)

d.f.
?2

 

Expert Solution
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Step 1

Hello

According to Bartleby Guidelines we are supposed to answer only first three sub parts so for rest of solution kindly post it again or with specific instructions.

Thank you.

Part (a):

The probability mass function for Poisson distribution is as follows:

Statistics homework question answer, step 1, image 1

Here, λ is 2.98 it is the average number of bacteria colonies per field.

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