9.1

25.

  1. .181

  2. 31.84>10. Sample is Less than 5% of population

  3. .168 and .194

  4. I am 90% confident that the population proportion of American adults 18 years old and older who have donated blood in the last 2 years is between .168 and .194.

26.

  1. .430

  2. 282.60>10. Sample is less than 5% of population.

  3. .401 and .459

  4. I am 95% confident that the population proportion of 25 year old and up Americans, who do not have $10,000 in savings is between .401 and .459.

27.

  1. .519

  2. 250.39>10. Sample is less than 5% of population.

  3. .488 and .550

  4. It is possible that the population proportion is more than 60%. It is possible that the true proportion was not captured in the data, or confidence interval. Yet, it is not likely sicne the .6 is outside of the confidence interval at 95%.

  5. .450 and .512.

28.

  1. .75

  2. 192>10. Sample is less than 5% of population.

  3. .715 and .785.

  4. It is possible that the population proportion of adults in America 18 and older that find family values extremely or very important in a presidential candidate, is below 70%. Yet, it is not likely since it is outside the confidence interval of 99%.

  5. .215 and .285.

29.

  1. .071 and .151

  2. .058 and .164

  3. Increasing confidence level will result in an increase of the margin of error.