Question
In: Statistics and Probability
A safety officer wants to prove that the average speed of cars driven by a school...
A safety officer wants to prove that the average speed of cars driven by a school is less than 25 mph. Suppose that a random sample of 14 cars shows an average speed of 24.0 mph, with a sample standard deviation of 2.2 mph. Assume that the speeds of cars are normally distributed.
Provide the notation for the underlined value. That is, what does the underlined value represent?
Solutions
Expert Solution
Solution :
Given that,
mean = 
= 25
standard deviation = 
= 2.2
n = 14
= 25
=
/ 
P(
< 24 )
P (
-
/
) < ( 24 - 25 / 0.5880 )
P ( z < -1 / 0.5880 )
P ( z < -1.70 )
= 0.0446
Probability = 0.0446
orchestra answered 2 years agoRelated Solutions
A safety officer wants to prove that the average speed of cars driven by a school...
A safety officer wants to prove that the average speed of cars
driven by a school is less than 25 mph. Suppose that a random
sample of 14 cars shows an average speed of 24 mph, with a sample
standard deviation of 2.2 mph. Assume that the speed
of cars are normally distributed.
Provide the notation for the underlined value. That is, what
does it represent?
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Suppose the National Transportation Safety Board wants to
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Use α = 0.05
Compact Cars
643
655
702
Midsize Cars
469
427
525
Full-size Cars
484
456
402
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Suppose the National Transportation Safety Board (NTSB) wants to examine the safety of compact cars, midsize...
Suppose the National Transportation Safety Board (NTSB) wants
to examine the safety of compact cars, midsize cars, and full-size
cars. It collects a sample of three for each of the treatments
(cars types). Using the data provided below, test whether the mean
pressure applied to the driver’s head during a crash test is equal
for each types of car. Use α = 5%.
Compact cars
Midsize cars
Full-size cars
64
46
47
65
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Suppose the National Transportation Safety Board (NTSB) wants to examine the safety of compact cars, midsize...
Suppose the National Transportation Safety Board (NTSB) wants to
examine the safety of compact cars, midsize cars, and full-size
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Car Type
643
Compact
655
Compact
702
Compact
469
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427
MidSize
525
MidSize
484
FullSize
456
FullSize
402
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95
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98
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97
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92
99
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94
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