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 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?
Solutions
Expert Solution
Solution :
=
25
=24
S =2.2
n = 14
This is the left tailed test .
The null and alternative hypothesis is ,
H0 : =
25
Ha :
< 25
Test statistic = t
= (
- 
) / S / 
n
= (24-25) / 2.2 /
14
= -1.701
Test statistic = t= -1.701
P-value =0.0564
orchestra answered 3 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 24.0 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?
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pressure applied to the driver’s head during a crash test is equal
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