Question

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 290 engines and the mean pressure was 6.5 pounds/square inch (psi). Assume the population variance is 1.00. If the valve was designed to produce a mean pressure of 6.4 psi, is there sufficient evidence at the 0.1 level that the valve does not perform to the specifications? Step 1 of 6 : State the null and alternative hypotheses.

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 290290 engines and the mean pressure was 6.56.5 pounds/square inch (psi). Assume the population variance is 1.001.00. If the valve was designed to produce a mean pressure of 6.46.4 psi, is there sufficient evidence at the 0.10.1 level that the valve does not perform to the specifications?

Step 2 of 6 :

Find the value of the test statistic. Round your answer to two decimal places.

Answer #1

Solution:

Step 1)

The null and alternative hypothesis are

**H _{0}:
= 6.4**

**H _{a} ;
6.4**

Step 2)

Given ,
^{2} = 1.00

So that , = 1.00

The test statistic z is given by

z =

= (6.5 - 6.4) / (1.00/290)

= 1.70

**Test statistic z = 1.70**

An engineer has designed a valve that will regulate water
pressure on an automobile engine. The valve was tested on
110engines and the mean pressure was 4.6 pounds/square inch (psi).
Assume the population standard deviation is 0.8 If the valve was
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evidence at the 0.02 level that the valve does not perform to the
specifications?
Step 3 of 6:
Specify if the test is one-tailed or two-tailed.
An engineer...

An engineer has designed a valve that will regulate water
pressure on an automobile engine. The valve was tested on 170
engines and the mean pressure was 4.7 pounds/square inch (psi).
Assume the population variance is 1.00. If the valve was designed
to produce a mean pressure of 4.5 psi, is there sufficient evidence
at the 0.05 level that the valve does not perform to the
specifications?
Step 5 of 6:
Identify the level of significance for the hypothesis test.

An engineer has designed a valve that will regulate water
pressure on an automobile engine. The valve was tested on 170
engines and the mean pressure was 4.7 pounds/square inch (psi).
Assume the population variance is 1.00. If the valve was designed
to produce a mean pressure of 4.5 psi, is there sufficient evidence
at the 0.05 level that the valve does not perform to the
specifications?
A. There is sufficient evidence to support the claim that the
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An engineer has designed a valve that will regulate water
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Assume the population variance is 0.81 . If the valve was designed
to produce a mean pressure of 6.5 psi, is there sufficient evidence
at the 0.02 level that the valve performs above the specifications?
Step 1 of 6 : State the null and alternative hypotheses.

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Assume the population variance is 0.36. If the valve was designed
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at the 0.02 level that the valve performs above the
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Identify the level of significance for the hypothesis test.

An engineer has designed a valve that will regulate water
pressure on automobile engine. The valve was tested on 180 engines
and the mean pressure was 4.6 pounds/square inch (psi). Assume the
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produce a mean pressure of 4.5 psi, is there sufficient evidence at
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Find the P-value of the test statistic. Round your answer to
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An engineer has designed a valve that will regulate water
pressure on an automobile engine. The valve was tested on 290
engines and the mean pressure was 6.1 pounds/square inch (psi).
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