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MATH 110 Module 5 Exam _Statistics (Portage learning)

Module 5 Exam
Exam Page 1
Suppose that you take a sample of size 18 from a population that is not normally distributed. Can
the sampling distribution of xxbe approximated by a normal probability distribution?
No, the sampling distribution of xbar cannot be approximated by a normal probability distribution
because the population is "not normally" distributed and the sample size is less than 30.
Answer Key
Exam Page 3
Suppose that in a large hospital system, that the average (mean) time that it takes for a nurse to
take the temperature and blood pressure of a patient is 170 seconds with a standard deviation of 40
seconds. What is the probability that 20 nurses selected at random will have a mean time of 165
seconds or less to take the temperature and blood pressure of a patient?
u = 170
o = 40
n = 20
xbar = 165
xbar - u = 165 - 170 = -5
oxbar = o / √n
40 / √20 = 8.94
z = ((xbar - u) / oxbar)
( -5 / 8.94) = -0.559 = -0.56 look on chart ---> 0.2877
P(Z < -0.56) = 0.2877
0.2877 probability that if 20 nurses were selected at random, that they would have a mean
time of 165 seconds or less in time spent taking a patients temp. and b/p

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Specificaties

Niveau: University
School: Chamberlain
Opleiding: Nursing
Studiejaar: 2024
Boek
Naam boek: MATH 110 Module 5 Exam _Statistics (Portage learning)
Document
Rubriek: Samenvattingen
Gemaakt op: 03-08-2024
Type: .pdf
Pagina's: 5
Taal: English

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