Statistics H1.1-1.2

The data were collected from a statistics class. The column heads give the​ variable, and each of the rows represents a student in the class. There are observations on how many​ people?

4

The accompanying data were collected from a statistics class. The column heads give the​ variable, and each of the rows represents a student in the class. Suppose you decided to code handedness using​ Right-handed as the label for the column. How many ones and how many zeros would there​ be? There would be ___ one(s) and ___ zero(s).

3 ones and 6 zeros

Data are more than just​ numbers, because data have​ _____.

context

The data were collected from a statistics class. The column heads give the​ variable, and each of the rows represents a student in the class. How many variables are​ there?

9

The data were collected from a statistics class. The column head gives the​ variable, and each of the other rows represents a student in the class. Explain why the variable​ Male, is​ categorical, even though its values are numbers.​ Often, it does not make​ sense, or is not even possible to add the values of a categorical variable. Does it make sense for​ Male? If​ so, what does the sum​ represent? Part 2 Does it make sense to add the values of the categorical variable​ Male? If​ so, what does the sum​ represent? A. It makes sense. If the numbers are​ added, the sum is the number of males. Your answer is correct. B. It makes sense. If the numbers are​ added, the sum is the number of females. C. It does not make sense.

A. It makes sense. If the numbers are​ added, the sum is the number of males.

A high school student kept track of the calorie content of all the snacks he ate for one week. He also took note of whether the snack was mostly​ "sweet" or​ "salty," with the accompanying results. a. Write these data as they might appear in stacked format with codes. b. Write these data as they might appear in unstacked format. Part B Write these data as they might appear in unstacked format.

A. Sweet. Salty 90. 175 320. 700 550. 550 550. 600 700 90

The data were collected from a statistics class. The column head gives the​ variable, and each of the rows represents a student in the class. Complete parts a and b Part a. Is the variable Eye Color numerical or​ categorical? Explain. A. The variable is categorical because the values are categories. Your answer is correct. B. The variable is categorical because the values are numbers. C. The variable is numerical because the values are numbers. D. The variable is numerical because the values are categories.

A. The variable is categorical because the values are categories.

The data were collected from a statistics class. The column head gives the​ variable, and each of the rows represents a student in the class. Complete parts a and b. Part b. Is the variable Weight numerical or​ categorical? Explain. A. The variable is numerical because the values are numbers. Your answer is correct. B. The variable is numerical because the values are categories. C. The variable is categorical because the values are categories. D. The variable is categorical because the values are numbers.

A. The variable is numerical because the values are numbers.

A student did a survey on the age of marriage for married male and female students. Use the accompanying data to complete parts​ (a) through​ (c). Part a.Is the format of the data set stacked or​ unstacked? A. The format is​ stacked, because the columns represent the two different genders. B. The format is​ unstacked, because the columns represent the two different genders. C. The format is​ unstacked, because each row of the table represents one couple. Your answer is not correct. D. The format is​ stacked, because each row of the table represents one couple.

B. The format is​ unstacked, because the columns represent the two different genders.

A student did a survey on the age of marriage for married male and female students. Use the accompanying data to complete parts​ (a) through​ (c). Part B . If you answered​ "stacked" in part​ a, then unstack the data set. If you answered​ "unstacked," then stack and code the data​ set, letting 1 represent​ "Men" and 0 represent​ "Women". Choose the correct answer below.

B. Age | Gender 28. 1 30. 1 31. 1 33. 1 26. 1 19. 0 21. 0 20 0 35. 0 25. 0

A high school student kept track of the calorie content of all the snacks he ate for one week. He also took note of whether the snack was mostly​ "sweet" or​ "salty," with the accompanying results. a. Write these data as they might appear in stacked format with codes. b. Write these data as they might appear in unstacked format. Part A Write these data as they might appear in stacked format with codes.

C. Calories. Sweet 90. 1 320 1 550. 1 550 1 700. 1 90. 1 175. 0 700. 0 550. 0 600 0

The data were collected from a statistics class. The column head gives the​ variable, and each of the other rows represents a student in the class. Explain why the variable​ Male, is​ categorical, even though its values are numbers.​ Often, it does not make​ sense, or is not even possible to add the values of a categorical variable. Does it make sense for​ Male? If​ so, what does the sum​ represent? Part 1 Explain why the variable Male is​ categorical, even though its values are numbers. A. Male is categorical with two categories. Its variable coding rule is that​ 1's represent females and​ 0's represent males. B. Male is categorical with one category. Its variable coding rule is that​ 1's represent males and​ 0's do not represent anything. Your answer is not correct. C. Male is categorical with two categories. Its variable coding rule is that​ 1's represent males and​ 0's represent females.

C. Male is categorical with two categories. Its variable coding rule is that​ 1's represent males and​ 0's represent females.

The variable​ "eye color" is an example of what type of​ variable? Choose the correct answer below. A. Algebraic B. Contextual C. Categorical D. Your answer is correct. E. Numerical

C. Categorical

The process of representing categorical variables with numbers​ (such as letting a 1 represent​ "smoker" and a 0 represent​ "non-smoker") is called ​ _______.

Coding

A student shared data from the StatCrunch Friend Data Application. Data on gender and number of wall posts for a sample of friends are shown in the accompanying table. Complete parts a through c. Part c. f you answered​ "stacked" in part​ a, then unstack the data into two columns labeled Male and Female. If you answered​ "unstacked," then stack the data into one column and choose an appropriate name for the stacked variable.

D. Male Female 1926. 9440 180. 147 834 1230 93. 505

Which of the following questions should be asked when developing an understanding of​ data? Choose the correct answer below. A.Who collected the​ data? B. How were the variables​ measured? C. What variables were​ measured? D. All of these questions are important.

D. All of these questions are important

What are two basic types of variables in​ statistics? Choose the correct answer below. A. Numerical and categorical B. Your answer is correct. C. Numerical and algebraic D. Numerical and contextual E. Contextual and categorical

E. Contextual and categorical

A student did a survey on the age of marriage for married male and female students. Use the accompanying data to complete parts​ (a) through​ (c). Part C There are two variables​ here: Gender and Age. Which of them is numerical and which is​ categorical? Gender is ______ because it ________________________. Age is _______ because it _________________________.

Gender is categorical because it describes a quality of the object of interest. Age is numerical because it describes a quantity of the object of interest.

A student shared data from the StatCrunch Friend Data Application. Data on gender and number of wall posts for a sample of friends are shown in the accompanying table. Complete parts a through c. Part b. Explain the coding. What do​ "1" and​ "0" represent?

In the Male column the data value​ "1" represents a male student and the data value​ "0" represents a female student.

The circles shown to the right are​ similar, but not exactly the same. This is an example of​_______.

The circles shown to the right are​ similar, but not exactly the same. This is an example of variation.

A student shared data from the StatCrunch Friend Data Application. Data on gender and number of wall posts for a sample of friends are shown in the accompanying table. Complete parts a through c. Part a. Is the format of this data set stacked or​ unstacked?

The format of the data set is stacked because each row represents one person of interest.

In​ statistics, variables are​ _____.

characteristics of people or things.

In​ statistics, the data we work with is just one part of a bigger picture called the​ ____.

population

Categorical variables are also referred to as​ ______ variables.

qualitative