Free Printable Stats Ch 9

Worksheets

Stats Ch 9

Total questions: 18

Worksheet time: 23mins

Name

Class

Date

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

parameter

statistic

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

parameter

statistic

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

parameter

statistic

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.

parameter

statistic

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

parameter

statistic

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

parameter

statistic

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

parameter

statistic

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.

10.

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.

11.

A study of 10,000 males who smoke at least two packs of cigarettes daily shows that the mean life span is 65.3 years while the std. dev. is 3.4 years.

Find the mean for a random sample of 40 males.

65.3

61.9

68.7

12.

A study of 10,000 males who smoke at least two packs of cigarettes daily shows that the mean life span is 65.3 years while the std. dev. is 3.4 years.

Find the standard deviation for a random sample of 40 males.

3.4

0.54

1.5

0.88

13.

A study of 10,000 males who smoke at least two packs of cigarettes daily shows that the mean life span is 65.3 years while the std. dev. is 3.4 years.

Find the probability that life span of the 40 males who smokes at least two packs of cigarettes daily is less than 65 yrs.

0.3925

0.5416

0.7116

0.2884

14.

When the sample size increases, the spread of the sampling distribution.....

decreases

weakens

increases

remains constant

15.

78% of flights on major airlines arrive on time. A random sample was taken of 100 flights.

Find the mean of the sample of 100 randomly selected flights.

0.78

0.22

0.078

0.022

16.

78% of flights on major airlines arrive on time. A random sample was taken of 100 flights.

Find the standard deviation of the sample of 100 randomly selected flights.

0.41

0.04

0.078

0.022

17.

The central limit theorem applies to both sample means and sample proportions.

True

False, only sample means

False, only sample proportions

18.

78% of flights on major airlines arrive on time. A random sample was taken of 100 flights.

Find the probability that more than 70% of the 100 randomly selected flights are on time.

0.5077

0.0267

0.9999

0.9733

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Stats Ch 9

Total questions: 18

Worksheet time: 23mins

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