A Researcher Wants to Estimate the Difference in the Means

question 10

Multiple Choice

A researcher wants to estimate the difference in the means of two populations.A random sample of 36 items from the first population results in a sample mean of 430.A random sample of 49 items from the second population results in a sample mean of 460.The population standard deviations are 120 for the first population and 140 for the second population.From this information, a 95% confidence interval for the difference in population means is ___.

• A)-95.90 to 35.90
• B)-85.44 to 25.44
• C)-76.53 to 16.53
• D)-102.83 to 42.43
• E)98.45 to 125.48

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Definitions:

Exotic Birds

Birds that are not native to a particular area and have been introduced from other regions, often as pets or for aviaries.

Endangered

refers to species that are at serious risk of extinction in the wild in the near future if the factors threatening their survival and reproduction do not improve.

Household Pets

Domesticated animals kept for companionship or pleasure rather than for work or survival.

Extirpated

Refers to a species that has been removed or destroyed entirely from a specific geographic area, though it exists elsewhere.