Stats Review 7A & 7B

The average annual salary for 35 of a company's 1200 accountants is $68,000.

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In a survey of a sample of high school students, 43% said that their mother has taught them the most about managing money.

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Sixty-two of the 97 passengers aboard the Hindenburg airship survived its explosion.

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In a survey of a sample of computer users, 8% said their computer had a malfunction that needed to be repaired by a service technician.

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In a recent year, the interest category for 12% of all new magazines was sports.

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In a recent survey of 1503 adults in the United States, 53% said they use both a landline and a cell phone,

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In  a recent year, the average math scores for all graduates on the ACT was 21.1.

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A researcher wants to estimate the average height of women aged 20 years or older. From a simple random sample of 45 women, the researcher obtains a sample mean height of 63.9 inches.
The parameter is  ...

• average height of 63.9 inches from the sample of 45 women.
• the average height of all women aged 20 years or older.

A nutritionist wants to estimate the mean amount of sodium consumed by children under the age of 10. From a random sample of 75 children under the age of 10, the nutritionist obtains a sample mean of 2993 milligrams of sodium consumed.
The statistic is ...

• the mean of 2993 milligrams of sodium obtained from the sample of 75 children.
• the mean amount of sodium consumed by children under the age of ten.

An education official wants to estimate the proportion of adults aged 18 or older who had read at least one book during the previous year. A random sample of 1006 adults aged 18 or older is obtained, and 835 of those adults had read at least one book during the previous year.
The statistic is ...

• 835/1006 = 0.830, the proportion who read a book in the sample
• the proportion of adults 18 or older who read a book in the previous year.