Determine the point estimate of the population proportion(), the margin of error ()

and the number of individuals in the sample with the specified characteristic () for the

following intervals and sample size.

a. Lower bound: 0.054, upper bound: 0.078, = 2000.

b. Lower bound: 0.853, upper bound: 0.871, = 8500

4. The following data represent the ages (in weeks) at which babies first crawl based on a

survey of 20 mothers conducted by Essential Baby. Construct and interpret a 99.5%

confidence interval for the mean age at which baby first crawls.

52 30 44 35 39 26 37

47

49

37

40

56

42

26

25

39

29

28 50

33