A sales director has requested a report for individual team members within the division be developed. The director would like the report to be shared with all team members, but individual team members should not be identifiable within the report Which of the following access requirements would support the director's needs?

Correct Answer:B

Given the following customer and order tables:
Which of the following describes the number of rows and columns of data that would be present after performing an INNER JOIN of the tables?

Correct Answer:B
This is because an INNER JOIN is a type of join that combines two tables based on a matching condition and returns only the rows that satisfy the condition. An
INNER JOIN can be used to merge data from different tables that have a common column or a key, such as customer ID or order ID. To perform an INNER JOIN of the customer and order tables, we can use the following SQL statement:

This statement will select all the columns (*) from both tables and join them on the customer ID column, which is the common column between them. The result of this statement will be a new table that has seven rows and eight columns, as shown below:

The reason why there are seven rows and eight columns in the result table is because:
✑ There are seven rows because there are six customers and six orders in the original tables, but only five customers have matching orders based on the customer ID column. Therefore, only five rows will have data from both tables, while one row will have data only from the customer table (customer 5), and one row will have no data at all (null values).
✑ There are eight columns because there are four columns in each of the original tables, and all of them are selected and joined in the result table. Therefore, the result table will have four columns from the customer table (customer ID, first name, last name, and email) and four columns from the order table (order ID, order date, product, and quantity).

Which one of the following values will appear first if they are sorted in descending order?

Correct Answer:C
The value that will appear first if they are sorted in descending order is Xavier. Descending order means arranging values from the largest to the smallest, or from the last to the first in alphabetical order. In this case, Xavier is the last name in alphabetical order, so it will appear first when sorted in descending order. The other names will appear in the following order: Molly, Adam, Aaron. Reference: Sorting Data - W3Schools

Andy is a pricing analyst for a retailer. Using a hypothesis test, he wants to assess whether people who receive electronic coupons spend more on average.
What should Andy's null hypothesis be?

Correct Answer:C

The null hypothesis presumes the status quo. Andy is testing whether or not people who receive an electronic coupon spend more on average, so, the null hypothesis states that people who receive the coupon do spend more on average.

Which of the following technologies would be best suited for creating a multiple linear regression model?

Correct Answer:B
R is a statistical programming language that is specifically designed for data analysis and statistical modeling, making it highly suitable for creating a multiple linear regression model. It has extensive libraries such as lm() for linear modeling, which simplifies the process of model creation, diagnostics, and interpretation. R also provides robust tools for data manipulation and visualization, which are essential for preparing data for regression analysis and understanding the results123.
While Microsoft Power BI, SQL, and Tableau have capabilities for regression analysis, they are more limited compared to R. Power BI and Tableau are primarily business intelligence tools that offer some built-in analytics capabilities, but they are not as comprehensive as
R. SQL is a database query language that can perform some statistical calculations, but it is not inherently designed for statistical modeling4567.
References:
✑ Multiple Linear Regression in R: Tutorial With Examples - DataCamp1.
✑ Implementing linear regression in Power BI - SQLBI5.
✑ Choosing a Predictive Model - Tableau6.
✑ How Predictive Modeling Functions Work in Tableau7.

A customer's telephone number is in the format 123-456-7890. Which of the following data types is used for the phone number?

Correct Answer:C
A telephone number, despite being composed of digits, is not used for calculations and often includes formatting characters such as hyphens (-). Therefore, the most appropriate data type for a telephone number is Text (oVr ARCHAR in SQL databases), which can accommodate various formats and lengths, and preserve leading zeros that might be present in some phone numbers. Storing phone numbers as numeric data types would strip away any formatting and could lead to the loss of significant leading digits (like zeros in international numbers).
✑ Boolean is a binary data type and only represents true or false values.
✑ Date is a data type used for dates.
✑ Number could technically store phone numbers, but it is not suitable due to the reasons mentioned above.
References:
✑ Best Practices for Storing Phone Numbers1
✑ Data Types in SQL for Phone Numbers2