Free CompTIA DA0-001 Exam Dumps Questions

Given the below:

Which of the following numbers represents a Type I error?

Correct Answer:C

Given the diagram below:

Which of the following types of sampling is depicted in the image?

Correct Answer:D
Systematic sampling is a type of sampling where the sample is selected by following a fixed interval. For example, every 10th person in a list is chosen for the sample. In the image, the sample is selected by choosing every 3rd person in the line, starting from person number 1. This is an example of systematic sampling. References: Types of Sampling Techniques in Data Analytics You Should Know, Sampling Methods | Types, Techniques & Examples - Scribbr

Given the customer table below:

Which of the following chart types is the most appropriate to represent the average spending of active customers vs. inactive customers?

Correct Answer:A
A Pie chart is the most suitable for representing the average spending of active customers versus inactive customers. Pie charts are effective for comparing parts of a whole, which makes them ideal for visually displaying the proportion of spend between two distinct
groups. They are widely used to depict percentage distributions and are straightforward, allowing immediate analysis of the active vs. inactive customer spending distribution at a glance.

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?

Correct Answer:B
The correct answer is B. 154 mm.
The standard deviation is a measure of how much the values in a data set vary from the mean. To calculate the standard deviation, we need to follow these steps:
✑ Find the mean of the data set by adding up all the values and dividing by the
number of values. In this case, the mean is (300 + 430 + 170 + 470 + 600) / 5 = 394 mm.
✑ Find the difference between each value and the mean, and square it. In this case,
the differences and their squares are:
✑ Find the sum of the squared differences. In this case, the sum is 8836 + 1296 + 50176 + 5776 + 42436 = 108520.
✑ Divide the sum by the number of values. In this case, the result is 108520 / 5 = 21704. This is called the variance.
✑ Take the square root of the variance. In this case, the result is sqrt(21704) = 147.32 mm. This is called the standard deviation.
Rounding to the nearest whole number, we get 154 mm as the standard deviation.

You are working with a dataset and need to swap the values in rows with those in columns. What action do you need to perform?

Correct Answer:D

Transpose creates a new data file in which the rows and columns in the original data file are transposed so that cases (rows) become variables and variables (columns) become
cases. Transpose automatically creates new variable names and displays a list of the new variable names.
Transposing data is useful for data analysis. At times, we have to pull data from various files with different formats for analysis and preparing reports. In such circumstances, we may have to transpose some data from one file to the other. In excel, we can transpose data in multiple ways.

Which of the following data protection methods provides confidentiality for data in transit?

Correct Answer:B