To check the average cost to repair a bridge, a random sample of n=55 bridges was chosen. The mean and standard deviation for the sample are $25,788 and $1,540, respectively. Records from previous years indicate an average bridge repair cost was $25,003. Use the sample data to test that the mean repair cost is greater than $25,003 at the level of significance 0.05. Let T_{obs} denote the observed value of the test statistics you use for testing the hypothesis. Answer choice T_{obs} = 3.78, since T_{obs} > 1.645 we conclude that the average bridge repair cost is greater than $25,003. T_{obs} = 3.78, since T_{obs} > 1.96 we conclude that the average bridge repair cost is less than $25,003. T_{obs} = 3.78, since T_{obs} > 1.645 we conclude that the average bridge repair cost is less than $25,003. T_{obs} = 28.03, since T_{obs} > 1.645 we conclude that the average bridge repair cost is less than $25,003. T_{obs} = 28.03, since T_{obs} > 1.645 we conclude that the average bridge repair cost is greater than $25,003. T_{obs} = 3.78, since T_{obs} > 1.96 we conclude that the average bridge repair cost is greater than $25,003. T_{obs} = 28.03, since T_{obs} > 1.96 we conclude that the average bridge repair cost is greater than $25,003. T_{obs} = 28.03, since T_{obs} > 1.96 we conclude that the average bridge repair cost is less than $25,003.

Name: To check the average cost to repair a bridge, a random sample of n=55
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Description: To check the average cost to repair a bridge, a random sample of n=55 bridges was chosen. The mean and standard deviation for the sample are $25,788 and $1,540, respectively. Records from previous years indicate an average bridge repair cost was $25,

A First Course in Probability (10th Edition)

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To check the average cost to repair a bridge, a random sample of n=55 bridges was chosen. The mean and standard deviation for the sample are $25,788 and $1,540, respectively. Records from previous years indicate an average bridge repair cost was $25,003. Use the sample data to test that the mean repair cost is greater than $25,003 at the level of significance 0.05.

Let T_{obs} denote the observed value of the test statistics you use for testing the hypothesis.

Answer choice

T_{obs} = 3.78, since T_{obs} > 1.645 we conclude that the average bridge repair cost is greater than $25,003.

T_{obs} = 3.78, since T_{obs} > 1.96 we conclude that the average bridge repair cost is less than $25,003.

T_{obs} = 3.78, since T_{obs} > 1.645 we conclude that the average bridge repair cost is less than $25,003.

T_{obs} = 28.03, since T_{obs} > 1.645 we conclude that the average bridge repair cost is less than $25,003.

T_{obs} = 28.03, since T_{obs} > 1.645 we conclude that the average bridge repair cost is greater than $25,003.

T_{obs} = 3.78, since T_{obs} > 1.96 we conclude that the average bridge repair cost is greater than $25,003.

T_{obs} = 28.03, since T_{obs} > 1.96 we conclude that the average bridge repair cost is greater than $25,003.

T_{obs} = 28.03, since T_{obs} > 1.96 we conclude that the average bridge repair cost is less than $25,003.

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