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An engineering firm is evaluating their back charges. They…

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An engineering firm is evaluating...
An engineering firm is evaluating their back charges. They originally believed their average back charge was $1800. They are concerned that the true average is higher, which could hurt their quarterly earnings. They randomly select 40 customers, and calculate the corresponding sample mean back charge to be $1950. If the standard deviation of back charges is $500, and alpha = 0.01, should the engineering firm be concerned? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
Submitted: 8 years ago.Category: Math Homework
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6/12/2010
Math Tutor or Teacher: abozer,
 replied 8 years ago
abozer
Category: Math Homework
Satisfied Customers: 6,159
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Hi again,

Ho: μ ≤ 1800
Ha: μ > 1800

Test statistic: z = (1950 - 1800)/(500/sqrt(40)) = 1.897

Critical value: z cr = 2.326

We cannot reject the null hypothesis since the test statistic is not more extreme than the critical value.

We don't have sufficient evidence to conclude that the true average is higher than $1800.
abozer
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Satisfied Customers: 6,159
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Customer reply replied 8 years ago
I asked you the wrong question can i substitute a different question?
Math Tutor or Teacher: abozer,
 replied 8 years ago
You can post it here.
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Customer reply replied 8 years ago
The ages of 24 employees in a company are listed below: Use the stem & leaf plot to determine the shape of the distribution. Choose the best answer.
(Points: 6)
Is the data symmetric , skewed right, skewed left or bimodal
Customer reply replied 8 years ago
The ages of 24 employees in a company are listed below: Use the stem & leaf plot to determine the shape of the distribution. Choose the best answer.

Is the data symmetric , skewed right, skewed left or bimodal
Math Tutor or Teacher: abozer,
 replied 8 years ago
I cannot see the data posted. Copy-paste doesn't work for images.
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