Sample mean = 5.5, 8=2.517. df-8 and confidence level 95% (corresponding test statistic value is 2303). Based on this information answer the following: Which test is appropriate, z-test or t-test? Type either "z-test" or "t-test" t-test Ą What was the sample size? A Calculate the margin of error. (Report two decimal point, #.##) A Calculate the confidence interval-write lower and uppler value using comma.(Report two decimal point: #.##, #.##) Ą If the df increases to 30 then what will impact on the margin of error? Write either "increase" or "decrease" or "no change decrease ^ If the df increases to 30 then what will impact on the confidence interval? Write either "wide" or "narrow" or "no change" decrease A/
