1. The waiting times (in minutes) of customers at a certain bank is given below. 5.5 6.5 6.7 7.2 6.4 7.3 (a) Construct a 95% confidence interval for the mean waiting time of all customers at the bank. (b) Based on the confidence interval in (a), will the bank manager be satisfied if she wishes the average waiting time in her bank to be less than 7 minutes

The 95%  confidence interval is

Step-by-step explanation:

From the question we are told that

  The data is  6.5   6.7    7.2    6.4    7.3

Generally the sample  mean is mathematically represented as

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Generally the standard deviation is mathematically represented as

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Gnerally the degree of freedom is mathematically represented as

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From the question we are told the confidence level is  95% , hence the level of significance is    

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Generally from the t distribution table the critical value  of   is  

Generally the margin of error is mathematically represented as  

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Generally 95% confidence interval is mathematically represented as  

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-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8

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