The accompanying data set contains seven variables, x 1 , x 2 , x 3 , x 4 , x 5 , x 6 , and x 7 There are missing values in the data set a Remove variables x 2 , x 6 , and x 7 from the data set Which of the remaining variables have missing values b Which observations have missing values c How many ...

a Variables x 1 x 3 x 5 all have at least one missing value b Observations 15 2 ...

The accompanying data set contains seven variables, x 1 , x 2 , x 3 , x

Question:

The accompanying data set contains seven variables, x₁, x₂, x₃, x₄, x₅, x₆, and x₇. There are missing values in the data set.

a. Remove variables x₂, x₆, and x₇ from the data set. Which of the remaining variables have missing values?

b. Which observations have missing values?

c. How many missing values are in the data set?

d. If there are missing values in x₁, replace the missing values with “Unknown.” How many missing values were replaced?

e. Handle the missing values for numerical variables using the imputation strategy. If there are missing values in x₃, impute the missing values using the mean value of x₃. If there are missing values in x₄, impute the missing values using the median value of x₄. If there are missing values in x₅, impute the missing values using the mean value of x₅. What are the average values of x₃, x₄, and x₅ after imputation?

f. Remove observations that have the value “F” for x₁ and values lower than 1,020 for x₄. How many observations remain in the data set?

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