1.             The process of using sample statistics to draw conclusions about the population parameters is called

  A summary measure that is computed to describe a characteristic of a sample taken from a population is called

a statistic

1.             Which of the following is an element of descriptive statistical problems?

a.    calculating a sample mean

b.    estimating a population parameter

Viewership studies using a sample of television households

       indicate that the share of the audience for the Channel 4

       News has increased by 12% since Jayne Barnwell was

       added to the 11:00 P.M. news team. This is an example of:

inferential statistics

You are reviewing your portfolio and note the amount of interest earned for each of the stocks in which you have invested. 

       The type of variable most appropriate to their measurements is:

numeric, continuous

You respond to a survey question “Where do you get your

daily news?”  The variable representing this question is:

categorical 

What's true about constructing a frequency distribution?

The classes do not overlap

The Department of Transportation estimates that there is an average of 20 accidents per day. 

This is an example of: 

statistical inference

In a symmetric distribution:

the mean is equal to the median

For a set of data, the mean is 40 and the standard deviation is 

           10.  Suppose one of the observations has a value of 65.  What is

             the standardized z-score for this observation?

(65-10)/10= +2.5

The average age of these citizens is:

73.58

6                   01234555689

7                   0334566

8                   112679

                                            9              02

The median age of these citizens is:

73

6                   01234555689

7                   0334566

8                   112679

9                   02

The mode of the age of these citizens is:

6                   01234555689

7                   0334566

8                   112679

9                   02

The range of the age of these citizens is:

32

The sample variance of the age of these citizens is:

96.01

The sample standard deviation is:

9.80

The sample appears to have a distribution that is:

right-skewed

6                   01234555689

7                   0334566

8                   112679

9                   02

Suppose you were to construct a frequency distribution representing the sample of ages.  For six classes, the best value of width is:

For a width of 5, if the first class has a lower limit of 60,

how many senior citizens would be classified into the second class?

6                   01234555689

7                   0334566

8                   112679

9                   02

These data would best be represented by a:

The highest point of a normal curve occurs at:

The standard deviation of a standard normal distribution:

is always equal to one

Larger values of the standard deviation result in a normal curve that is:

wider and flatter

Which of the following is true about the normal distribution?

the mean, median, mode are the same

Subtract z-score from 1