1.3 Homework STA

How do parameter and statistic differ?

A parameter is a numerical measurement of a population; a statistic is a numerical measurement of a sample.

which of the following is associated with a parameter

Data that were obtained from an entire population. (a parameter is a numerical measurement describing some characteristics 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

Number of suitcases on a plane (the number of suitcases on a plane is a number representing a count. This would consists of discrete data)

determine whether the given value is a statistic or a parameter in a study of all 1680 students at a college it is found that 40% own a vehicle

Parameter because the value is a numerical measurement describing a characteristic of a population

determine whether the given value is a statistic or a parameter a homeowner measured the voltage supplied to his home on 6 days of a given week, the average (mean) value is 134.6 volts

The given value is a statistic for the week because the data collected represents a sample

determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Types of restaurants: fast foods, organic food, sea food, etc

The nominal level of measurement is most appropriate because data cannot be arranged in an ordering scheme.

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

The nominal level of measurement is the most appropiate because the data cannot be ordered.

determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Class time measured in minutes

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

a particular country has 55 total states. If the areas of 45 states are added and the sum is divided by 45, the results is 196,463 square kilometers. determine whether the given value is a statistic or a parameter

The result is a statistic because it shows 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 a tire pressure of 29 psi

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

determine whether the given value is from a discrete or continuous data set in an election poll, Melissa received 17,570,003 votes

a discrete data set because there are a finite number of possible values

determine whether the value is from a discrete or continuous data set Number of beats in song is 5

discrete

which of the following would be classified as categorical data?

hair color (hair color would be classified as categorical data. Categorical data consists of names or labels that are not numbers representing counts or measurements)

determine whether the given value is from a discrete or continuous data set When a bus is randomly selected it is found to have a weight of 1815.8kg

it is from a continuous data set because the number of possible values is infinite and not countable

which level of measurements consists of categories only where data cannot be arranged in an ordering scheme?

nominal

determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. positions of persons in a line

ordinal

which of the following is NOT a level of measurement ?

quantitative

determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Ages of children; 5, 6,7,8 and 9

ratio

identify the level of measurement of data, and explain what is wrong with the given calculation. in a survey the political parties of respondents are identified as 0 for Democrat, 1 for Republican, 2 for Libertarian, and 3 for anything else. The average (mean) is calculated for 509 respondents and the results is 1.1

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

identify the level of measurement of data, and explain what is wrong with the given calculation. in a set of data, internet speeds are represented as 100 for slow, 200 for medium, and 300 for fast. The average of the 575 interest speeds is 231.2

the data are at the *ordinal* level of measurement such data should not be used for calculations such as an average

determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. years in which a recession occurred

the interval 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 no natural starting zero point `

determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. years in which a war was started

the interval level of measurement is most appropriate because the data can be ordered, differences can be found and are meaningful, and there is no natural starting zero point

determine whether the given value is a statistic or a parameter the mean salary for construction workers is $45,000

the value is a parameter because it is a numerical measurement describing some characteristic of a population