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1. Sample of 60 records with 20 variables was taken from a data base and the # of errors (or incorrect felids)!r record is shown below: Record No. of Record No. of errorlrecord error/record RS 7 11-48 2 R9 5 R-50 3 R23 6 R-53 5 R30 2 R-54 1 R32 8 R-55 6 R38 6 1156 1 R39 2 R-57 3 R40 5 11-58 4 R45 4 R-60 8 Note 1: R-S means record (or row) number 5. The rest of the records have no error. Note 2: Show work a. Calculate mean and standard deviation. Show your complete work. b. What size of sample should be taken with 95% condence if the band (margin of error) is to be 10% of sample mean in part (a)? Show your complete work with the formula. c. Use 11 from part (b) and nd the Condence Interval for the Mean of the Population of # of errors if record, with 95% condence level. Assume the new sample mean and sample standard deviations are I and 1.40. Show the following: Standard Error(show the equation) and the value Value of Z or T Lower Interval Upper Interval Conclusion