Homework_8_Solutions

Homework_8_Solutions - Homework 8 Solutions 3.35 a Any...

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Homework 8 Solutions 3.35 a. Any sampling method for which it is possible to specify the chance that a particular individual in the population will be selected for the sample. b. Every conceivable group of units of the required size has the same chance of being the selected sample. 3.41 a. Stratified random sample. b. Cluster sample. 3.42 Systematic sample. 3.49 a. Convenience sample. b. Self-selected sample. c. Convenience sample. 10.13 a. Increasing the confidence level will increase the width of the interval. b. Decreasing the confidence level will decrease the width of the interval. 10.23 a. .90 or 90% (See Table 10.1) b. .95 or 95% (or 95.44%) c. .98 or 98% d. .99 or 99% 10.25 a. 0144 . 1027 ) 69 . 1 ( 69 . ) ˆ 1 ( ˆ ) ˆ .( . = = = n p p p e s b. .69 ± (1.96)(.0144), which is .69 ± .028, or .662 to .718. Roughly, .66 to .72 or 66% to 72% of the population (in 2001) thought it should be illegal to use a handheld cellular phone while driving a car. c. .69 ± (1.645)(.0144), which is .69 ± .024, or .666 to .714. Roughly, .67 to .71 or 67% to 71%. 10.26 The "formula" to use is S ample estimate ± Multiplier × Standard error . The sample estimate is 60 .
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