Question

A new design for the braking system on a certain type of car has been proposed. For the current system, the true average braking distance at 40 mph under specified conditions is known to be 120 ft. It is proposed that the new design be implemented only if sample data strongly indicates a reduction in true average braking distance for the new design.

Let μ = true average braking distance for the new design at 40
mph. The hypotheses are: *H*_{0}: *μ* = 120
vs. *H*_{a}: *μ* ≠ 120.

Suppose braking distance for the new system is normally distributed with σ=10. Let X-bar denote the sample average braking distance for a random sample of 36 observations. What is the P-value for X-bar = 117.2?

Apparently is not 0.0633 or 0.0465

Answer #1

This is the two tailed test .

The null and alternative hypothesis is

H_{0} :
= 120

H_{a} :
120

Test statistic = z

= ( - ) / / n

= (117.2 - 120) / 10 / 36

= -1.68

Test statistic = -1.68

P-value = **0.093**

A new design for the braking system on a certain type of car has
been proposed. For the current system, the true average braking
distance at 40 mph under specified conditions is known to be 120
ft. It is proposed that the new design be implemented only if
sample data strongly indicates a reduction in true average braking
distance for the new design.
(b) Suppose braking distance for the new system is normally
distributed with σ = 11. Let X...

A new design for the braking system on a certain type of car has
been proposed. For the current system, the true average braking
distance at 40 mph under specified conditions is known to be 120
ft. It is proposed that the new design be implemented only if
sample data strongly indicates a reduction in true average braking
distance for the new design.
(b) Suppose braking distance for the new system is normally
distributed with σ = 11. Let
X...

A new design for the braking system for a car has been proposed.
For the current braking system, the true
average
braking distance at 40 mph under specified condition is known to be
120 ft.
It is
proposed that the new braking system design will not be
implemented if evidence from sample data
indicates
that the braking distance is
HIGHER (compared to the current system).
Let µ denote the true average braking distance.
State an
appropriate hypothesis test that would...

1. A new design for the braking system for a car has been
proposed. For the current braking system, the true average braking
distance at 40 mph under specified condition is known to be 120
ft.
It is proposed that the new braking system design will not be
implemented if evidence from sample data indicates that the braking
distance is HIGHER (compared to the current system).
(a) Let µ denote the true average braking distance. State an
appropriate hypothesis test...

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