Free Mar-2024 UPDATED CompTIA DA0-001 Certification Exam Dumps is Online [Q49-Q64] : Free valid test braindumps : http://free.validbraindumps.com

NO.49 Five dogs have the following heights in millimeters:
300,430, 170, 470, 600
Which of the following is the standard deviation for the five dogs?

147mm

154mm

394 mm

21,704mm

NO.50 What R package makes it easy to work with dates?

Lubridate.

Datemath.

Stringr.

ggplot.

NO.51 Andrew conducts a study and wants to capture eye color.
What kind of data is eye color?
Choose the best response.

Discrete.

Categorical.

Continuous.

Alphanumeric.

NO.52 Which one of the following values will appear first if they are sorted in descending order?

Aaron.

Molly.

Xavier.

Adam.

NO.53 Which of the ing is the correct ion for a tab-delimited spre file?

tap

tar

sv

az

NO.54 A publishing group has requested a dashboard to track submissions before publication. A key requirement is that all changes are tracked, as multiple users will be checking out documents and editing them before submissions are considered final. Which of the following is the BEST way to meet this stakeholder requirement?

Display the version number next to each submission on the dashboard.

Present a data refresh date at the top of the dashboard.

Confirm the dashboard is adhering to the corporate style guide.

Use permissions to ensure users only see certain versions of the submissions.

NO.55 Which of the following BEST describes standard deviation?

A measure that is used to establish a relationship between two variables

A measure of how data is distributed

A measure of the amount of dispersion of a set of values

A measure that is used to find the significant difference between variables

Explanation
A measure of the amount of dispersion of a set of values. This is because standard deviation is a type of statistical measure that quantifies how much the values in a data set vary or deviate from the mean or the average of the data set. Standard deviation can be used to describe the spread or the distribution of the data, as well as to identify any outliers or extreme values in the data. For example, a low standard deviation indicates that the values are close to the mean, while a high standard deviation indicates that the values are far from the mean. The other options are not correct descriptions of standard deviation. Here is why:
A measure that is used to establish a relationship between two variables is not a correct description of standard deviation, but rather a description of correlation or regression, which are types of statistical measures that quantify how two variables are related or associated with each other. Correlation or regression can be used to test or model the dependence or the influence of one variable on another variable, as well as to predict or estimate the value of one variable based on the value of another variable.
A measure of how data is distributed is not a correct description of standard deviation, but rather a description of frequency or probability, which are types of statistical measures that quantify how often or how likely a value or an event occurs in a data set. Frequency or probability can be used to describe the occurrence or the chance of the data, as well as to compare or contrast different categories or groups of the data.
A measure that is used to find the significant difference between variables is not a correct description of standard deviation, but rather a description of hypothesis testing or inferential statistics, which are types of statistical methods that use sample data to make generalizations or conclusions about a population or a parameter. Hypothesis testing or inferential statistics can be used to test or verify a claim or an assumption about the data, as well as to measure the confidence or the error of the estimation.

NO.56 What type of report is commonly used to make operational decisions?

Strategic

Research

Compliance

Tactical

NO.57 The director of operations at a power company needs data to help identify where company resources should be allocated in order to monitor activity for outages and restoration of power in the entire state. Specifically, the director wants to see the following:
* County outages
* Status
* Overall trend of outages
INSTRUCTIONS:
Please, select each visualization to fit the appropriate space on the dashboard and choose an appropriate color scheme. Once you have selected all visualizations, please, select the appropriate titles and labels, if applicable.
Titles and labels may be used more than once.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

NO.58 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?

Five rows, eight columns

Seven rows, eight columns

Eight rows, seven columns

Nine rows, five columns

NO.59 A data analyst is attempting to understand how ice cream consumption is affected by different attributes. such as cost, temperature. and income level. Which of the following regression analyses should the data analyst perform to understand this relationship?

Logistic

Ordinary least squares

Cox

Polynomial

Explanation
answer: B. Ordinary least squares
Ordinary least squares (OLS) is a type of linear regression that is used to fit a regression model that describes the relationship between one or more predictor variables and a numeric response variable. Use when: The relationship between the predictor variable(s) and the response variable is reasonably linear. The response variable is a continuous numeric variable1.
In this case, the data analyst is interested in understanding how ice cream consumption (the response variable) is affected by different attributes, such as cost, temperature, and income level (the predictor variables).
Assuming that these variables have a linear relationship, OLS can be used to estimate the coefficients of the regression equation that best fits the data. OLS can also provide measures of goodness-of-fit, such as R-squared and adjusted R-squared, and test the significance of the coefficients using t-tests and F-tests2.
Option A is incorrect, as logistic regression is used to fit a regression model that describes the relationship between one or more predictor variables and a binary response variable. Use when: The response variable is binary – it can only take on two values1. Ice cream consumption is not a binary variable, but rather a continuous numeric variable.
Option C is incorrect, as Cox regression is used to fit a regression model that describes the relationship between one or more predictor variables and a survival time response variable. Use when: The response variable is the time until an event of interest occurs, such as death, failure, or recovery3. Ice cream consumption is not a survival time variable, but rather a continuous numeric variable.
Option D is incorrect, as polynomial regression is used to fit a regression model that describes the relationship between one or more predictor variables and a numeric response variable. Use when: The relationship between the predictor variable(s) and the response variable is non-linear1. If there is no evidence of non-linearity in the data, polynomial regression may not be appropriate, as it may overfit the data and produce unreliable estimates.

NO.60 Which of the following best describes the process of examining data for statistics and information about the data?
Cleansing

search

Profiling

Governance

NO.61 What feature varies on a bubble chart but not on a scatter plot?

Size

Y-position

X-position

Color

NO.62 You have two databases tables that you would like to join together using a foreign key relationship.
What term best describes this action?

Blending.

Appending.

Mixing.

Merging.

NO.63 A data scientist wants to see which products make the most money and which products attract the most customer purchasing interest in their company.
Which of the following data manipulation techniques would he use to obtain this information?

Data append

Data blending

Normalize data

Data merge

NO.64 You are creating a dashboard that shows the total revenue for your organization broken out by a variety of factors. Which one of these is a measure, rather than a dimension?

Revenue.

Month.

Department.

Geographic region.