Match the variable type to the appropriate summary.
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Match the variable type to the appropriate summary.       One Categorical Variable

 One Quantitative Variable

     Two Categorical Variables

      One Quantitative and One Categorical Variable

       Two Quantitative Variables

A .A single mean

B Correlation

C. A difference of means

D. A single proportion

E. A difference of proportions


Check all that apply to the expression  U1-U2

It summarizes a relationship between one quantitative and one categorical variable

It refers to a difference of means.

It is a difference of two population parameters

It is estimated by 

It is a sample statistic

It summarizes a relationship between two quantitative variables

It is estimated by  

It summarizes a relationship between two categorical variables


Check all that apply to the expression  p-hat1- p-hat2

It is estimated by 

It refers to a difference of means.

It summarizes a relationship between one quantitative and one categorical variable

It summarizes a relationship between two quantitative variables

It estimates  

It is a difference of two population parameters

It summarizes a relationship between two categorical variables

It is a sample statistic


  1. Check all that apply to the expression  r
  2. It summarizes a relationship between two categorical variables
  3. It estimates   (rho)
  4. It is a difference of two population parameters
  5. It refers to a single mean.
  6. It summarizes a relationship between two quantitative variables
  7. It is estimated by 
  8. It is a sample statistic
  9. It summarizes a relationship between one quantitative and one categorical variable


Identify what is wrong with the parameter definitions based on the description of a study. Choose only one for each parameter definition. You may use the same description more than once, and you do not need to use all descriptions.

Average electricity cost for the month of July is $350 for a sample of electricity bills from Austin residents.

         

      µ = electricity cost in July for all Austin residents

      Mean electricity cost in July for all Austin residents

      p = Mean electricity cost in July for all Austin residents

      µ = Mean electricity cost in July for all Austin residents

      µ = Mean for all Austin residents

      µ = Mean electricity cost in July for all Austin residents is $350


A. The value of the sample statistic is used in the parameter definition

B. Notation is missing or is incorrect

C. Quantitative variable is missing from parameter definition for a mean

D. Either the whole or the part is missing from parameter definition for a proportion

E. Word "mean" or "proportion" to indicate the type of parameter is missing or wrong

F. None of these. The parameter definition is correct and complete.


Identify what is wrong with the parameter definitions. Choose only one for each parameter definition. You may use the same description more than once, and you do not need to use all descriptions.

Based on a sample of electricity bills from Austin residents, 9% of the residents in the sample have signed up for the Green Energy program.

   

      p = Proportion of all Austin residents who have signed up for the Green Energy program is 0.09

      p = Proportion of all Green Energy subscribers

      p = Proportion of all Austin residents who subscribe to the Green Energy program

      phat = Proportion of all Austin residents who subscribe to the Green Energy program


A. The value of the sample statistic is used in the parameter definition

B. Notation is missing or is incorrect

C. Quantitative variable is missing from parameter definition for a mean

D. Either the whole or the part is missing from parameter definition for a proportion

E. Word "mean" or "proportion" to indicate the type of parameter is missing or wrong

F. None of these. The parameter definition is correct and complete.

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