##### General Statistics: Ch 1, Sec 1.3 HW

College: First year, College: Second year, College: Third year, College: Fourth year

Determine whether the given value is a statistic or a parameter.

A survey found that 30 % of all respondents go to school.

The value is a statistic because it is a numerical measurement describing some characteristic of a sample.

Determine whether the given value is a statistic or a parameter.

A sample of students is selected and it is found that 50 % own a computer.

Statistic because the value is a numerical measurement describing a characteristic of a sample.

A particular country has 45 total states. If the areas of 20 states are added and the sum is divided by 20, the result is 186 comma 979 square kilometers. Determine whether this result is a statistic or a parameter.

The result is a statistic because it describes some characteristic of a sample.

Determine whether the given value is from a discrete or continuous data set.

When a car is randomly selected, it is found to have an engine with 4 cylinders.

It is from a discrete data set because the number of possible values is finite or countable.

Determine whether the value given below is from a discrete or continuous data set.

When a car is randomly selected and weighed, it is found to weigh 1851.5 kg.

A continuous data set because there are infinitely many possible values and those values cannot be counted.

Determine whether the value is from a discrete or continuous data set.

Number of bacteria in a petri dish is 12,120

Discrete

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.

States in a region

Nominal

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.

Ranks of cars evaluated by a consumer's magazine

The ordinal level of measurement is most appropriate because the data can be ordered, but differences cannot be found or are meaningless.

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.

Miles of road

The ratio level of measurement is most appropriate because the data can be ordered, differences can be found and are meaningful, and there is a natural starting zero point.

Bushels of wheat

The ratio level of measurement is most appropriate because the data can be ordered, differences (obtained by subtraction) can be found and are meaningful, and there is a natural starting zero point.

In a survey, the responses of respondents are identified as 10 for a "yes", 20 for a "no", 30 for a "maybe", and 40 for anything else. The average (mean) is calculated for 715 respondents and the result is 22.3.

Identify the level of measurement of the data.

Explain what is wrong with the given calculation.

The data are at the nominal level of measurement.

Such data are not counts or measures of anything, so it makes no sense to compute their average (mean).

In a set of data, blood lead levels are represented as 10 for low, 20 for medium, and 30 for high. The average (mean) of the 529 blood lead levels is 25.4.

Identify the level of measurement of the data.

Explain what is wrong with the given calculation.

The data are at the ordinal level of measurement.

Such data should not be used for calculations such as an average.

Which of the following is associated with a parameter?

A parameter is a numerical measurement describing some characteristic
of a population. So, a parameter is associated with **data that
were obtained from an entire population**.

Which of the following consists of discrete data?

**The number of suitcases on a plane** is a number
representing a count. This would consist of discrete data.

Which level of measurement consists of categories only where data cannot be arranged in an ordering scheme?

The **nominal** level of measurement is characterized by
data that consist of names, labels, or categories only. The data
cannot be arranged in an ordering scheme (such as low to high).