The Projections of Male Life Expectancy at Age 65 in the United

question 68

Multiple Choice

The projections of male life expectancy at age 65 in the United States are summarized in the following table. (Here, x = 0 corresponds to the beginning of 2000.) Find the equation of the least-squares line for these data.Use the equation found to estimate the life expectancy at 65 of a male in 2050.

• A)y = 0.09x + 16; 20 years
• B)y = 0.3x + 10.38; 90 years
• C)y = 0.21x + 10.02; 86 years
• D)y = 0.3x + 10.38; 25 years

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Definitions:

Character Displacement

The tendency for two similar species to diverge (become more different) in areas where their ranges overlap; reduces interspecific competition.

Limiting Resource

An environmental resource that because it is scarce or unfavorable tends to restrict the ecological niche of an organism.

Genetic Mutations

Permanent alterations in the DNA sequence that makes up a gene, leading to variations in the phenotype of an organism, which can be beneficial, neutral, or harmful.

Precipitation

Any form of water, liquid or solid, that falls from the atmosphere and reaches the ground, including rain, snow, sleet, and hail.