ing.. Please complete the questions below and answer all parts of each question. 1. For a 90% confidence interval, determine the degrees of freedom, calculate the critical value (t*), calculate the Standard Error (SE = ), calculate the Margin of Error (MOE = t . ), and find the confidence interval ( a 1 t . ") for the given statistics: a = 762.59, s = 223.60, n = 61. Round to the nearest hundredths. 2. For a 98% confidence interval, determine the degrees of freedom, calculate the critical value (t*), calculate the Standard Error (SE = ), calculate the Margin of Error (MOE = t . ), and find the confidence interval ( a 1 t . ) for the given statistics: a - 762.59, s = 223.60, n = 61. Round to the nearest hundredths. 3. Complete the statements: The of the confidence interval is exactly twice that of the . When C increases from 90% to 98%, the width of the interval slightly . When the interval increases, the precision One way to reduce the margin of error is to increase the 4. A random sample of the costs of repair jobs at a brake repair shop produces a mean of $130.95 and a standard deviation of $21.03. If the size of the random sample is 30, calculate the 90 percent confidence interval for the average cost of the repair at this shop. Show all steps including checking conditions, work, and interpretation