Assume That Respondents Aged 65 or Older Are Only One-Third

question 24

Multiple Choice

Assume that respondents aged 65 or older are only one-third as likely to be in an Internet sample as their actual incidence in the population. Using propensity scoring, their responses would be:

• A)excluded from the sample to avoid any potential bias.
• B)included as is (only once) to keep the data truly representative.
• C)counted three times in the sample.
• D)included selectively (about one-third of the time) in the sample.
• E)included alternatively.

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Definitions:

Heterozygous

Having inherited two genes of different allelic forms for a trait.

Dominant Allele

The allele that is expressed when an individual possesses two different alleles for the same trait.

Recessive Allele

The allele that is not expressed when an individual possesses two different alleles for the same trait.

Carriers

Individuals who are heterozygous for a trait with a dominant and recessive allele and thus express only the characteristics associated with the dominant allele but may pass the recessive allele, including one for a recessive disorder, on to their offspring.