A series of surveys in GARISSA, carried out from 1990 to 1998, asked random samples of men and women aged 75 to estimate whether or not they would survive to the age of 85. Ten years after each survey the actual numbers surviving in each cohort were determined. All the sample sizes were large. The table summarizes the data.     Men Women Year of survey Percentage estimating they would survive to age 85 Percentage actually surviving to age 85 Percentage estimating they would survive to age 85 Percentage actually surviving to age 85 1990 39.6 27.0 45.9 44.2 1992 38.9 27.8 43.1 46.6 1994 41.3 29.4 46.5 45.1 1996 39.2 30.2 46.2 45.2 1998 39.8 33.2 48.6 47.4   i). Describe what the data show about actual survival rates for men and women over time.  ii). Describe what the data show about estimated survival rates for men and women over time.  Compare the abilities of men and women to estimate their survival rates.

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  1. A series of surveys in GARISSA, carried out from 1990 to 1998, asked random samples of men and women aged 75 to estimate whether or not they would survive to the age of 85. Ten years after each survey the actual numbers surviving in each cohort were determined. All the sample sizes were large. The table summarizes the data.

 

 

Men

Women

Year of survey

Percentage estimating they would survive to age 85

Percentage actually surviving to age 85

Percentage estimating they would survive to age 85

Percentage actually surviving to age 85

1990

39.6

27.0

45.9

44.2

1992

38.9

27.8

43.1

46.6

1994

41.3

29.4

46.5

45.1

1996

39.2

30.2

46.2

45.2

1998

39.8

33.2

48.6

47.4

 

  • i). Describe what the data show about actual survival rates for men and women over time. 
  • ii). Describe what the data show about estimated survival rates for men and women over time. 

Compare the abilities of men and women to estimate their survival rates.

 

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