Question

You intend to estimate a population mean μμ with the following sample.

50.5

55.6

67.3

43.3

44.2

56.4

69

52.9

55.6

46.9

53.7

65.3

You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to twp decimal places (because the sample data are reported accurate to one decimal place).

80% C.I. =

Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Answer 1

80% confidence interval =( 51.70 , 58.42 )