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質問 # 157
You receive a tab-delimited data file name sales.tsv.
You need to connect to the file.
Which option should you select in Tableau Desktop?
正解：
解説：
Explanation:
To connect to a tab-delimited data file named sales.tsv, you should select the option To a File > Text file in Tableau Desktop. This option will allow you to browse and select the file from your local or network drive and connect to it as a data source. You can then specify the text file properties, such as the delimiter, the text qualifier, and whether the first row contains column names. You can also join, union, or blend the data with other data sources if needed. References:
* Text File - Tableau
* Tableau Certified Data Analyst Study Guide
質問 # 158
When a Data Analyst needs to format workbook settings, which options are available in the Format Workbook panel?
正解：B
質問 # 159
A Data Analyst has the following dataset that contains null values in the Profits field.
The analyst wants each null Profit value to appear as 0.
Which two formulas achieve this goal? Choose two.
正解：B、D
解説：
Both IFNULL and ZN can replace null numeric values with zero. IFNULL([Profits], 0) returns the Profit value when it is non-null and explicitly returns 0 when the field is null. ZN([Profits] ) is a specialized null- handling function that returns the original expression when a value exists and zero when it is null. Tableau's documentation specifically describes ZN as useful for replacing null numeric values with zeros. ISNULL ([Profits]) returns a Boolean TRUE/FALSE result rather than a numeric replacement. Option C is also inappropriate because nulls cannot be reliably tested by ordinary equality or inequality comparisons; Tableau supplies ISNULL for that purpose, and the proposed formula does not substitute zero. Therefore, A and D both produce the required numeric result while retaining existing non-null Profit values.
質問 # 160
Open the link to Book1 found on the desktop. Open SalesVSProfit worksheet.
Add a distribution band on Profit to show the standard deviation from- 1 to 1.
正解：
解説：
check the steps below in explanation.
Explanation:
To add a distribution band on Profit to show the standard deviation from -1 to 1, you need to do the following steps:
* Open the link to Book1 found on the desktop. This will open the Tableau workbook that contains the SalesVSProfit worksheet.
* Click on the SalesVSProfit tab at the bottom of the workbook to open the worksheet. You will see a scatter plot that shows the relationship between Sales and Profit for each Sub-Category.
* Click on the Analytics tab on the left side of the workbook to open the Analytics pane. You will see a list of analytical objects that you can drag and drop onto your worksheet.
* Drag Distribution Band from the Analytics pane to Profit on the Rows shelf. This will add a distribution band on Profit that shows the average and confidence interval for each Sub-Category.
* Click on the Edit button on the distribution band to open the Edit Distribution Band dialog box. You will see options to customize your distribution band.
* Change the Band From value to -1 and the Band To value to 1. This will change the distribution band to show the standard deviation from -1 to 1, which means one standard deviation below and above the average.
* Click OK to apply the changes. You will see that the distribution band now shows a narrower range of values for Profit.
References: https://help.tableau.com/current/pro/desktop/en-us/analytics.htm https://help.tableau.com/current/pro/desktop/en-us/analytics_distributionband.htm https://help.tableau.com/current/pro/desktop/en-us/analytics_distributionband_edit.htm
質問 # 161
You have the following worksheet.
You want to create a table calculation that shows sales growth over each year.
How should you complete the formula? (Use the dropdowns in the Answer Area to select the correct options to complete the formula.)
正解：
解説：
Explanation:
There are different ways to create a table calculation that shows sales growth over each year, but one possible answer is:
* SUM([Sales])
* LOOKUP(SUM([Sales]), -1)
* PREVIOUS_VALUE(0)
To calculate the sales growth over each year, you need to compare the current year's sales with the previous year's sales and divide the difference by the previous year's sales. You can use the SUM, LOOKUP, and PREVIOUS_VALUE functions to achieve this. The SUM function returns the total sales for each year. The LOOKUP function returns the value of an expression in a target row, specified as a relative offset from the current row. The PREVIOUS_VALUE function returns the value of the expression in the previous row, or a specified value if there is no previous row. The formula for the table calculation is:
(SUM([Sales]) - LOOKUP(SUM([Sales]), -1)) / PREVIOUS_VALUE(0)
This formula subtracts the sales of the previous year (LOOKUP(SUM([Sales]), -1)) from the sales of the current year (SUM([Sales])) and divides the result by the sales of the previous year. If there is no previous year, the formula uses 0 as the denominator (PREVIOUS_VALUE(0)) to avoid division by zero errors.
References:
Tableau Certified Data Analyst Exam Prep Guide, page 11, section "Creating Calculated Fields" Tableau Help: SUM Function Tableau Help: LOOKUP Function Tableau Help: PREVIOUS_VALUE Function
質問 # 162
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