Miscellaneous Articles

Miscellaneous Articles for the support of statisticians. It includes different tools and software that help a statistician and a mathematician to work quickly and efficiently.

Significant Figures: Introduction and Example (2021)

by

Rounding of numbers is done so that one can concentrate on the most significant digits. For example, consider a flat price at 285500. A rich man might think in hundreds of thousands of dollars. To a rich man, it is easier to think in terms of 1 significant figure, the “3” in 300,000. A wage might be worried about the hundreds of dollars. To him, there may be four significant figures, the ‘2’, ‘8’, ‘5’, and ‘5’ in 285500.

Significant Figures Example

Consider an example: A weight recorded as 8426kg is correct to 3 decimal places. Reporting this weight in grams, the 8425g is nearest to the whole number. Recording the weight as 8.426kg correct to 4 significant figures and converting the weight to 8426g, the number of significant figures is still 4. Thus, sometimes it is more useful to express a result in terms of numbers of significant figures rather than the number of decimal places.

There are some rules for writing significant figures:

Rule 1: Include one extra figure for consideration. Simply drop the extra figure if it is less than 5. If it is 5 or more, add 1 to the previous figure before dropping the extra figure.

Rule 2: All non-zero digits are significant wherever they are recorded. For example, 7.22 is correct to 3 significant figures.

Rule 3: Zeros that lie between non-zero digits are significant. For example, 2003 is correct for 4 significant figures.
Rule 4: Zeros that are not preceded by a non-zero digit (leading zeros) are not significant. For example, 0.000325 is correct to 3 significant digits.

Rule 5: Zeros that appear after the decimal points (trailing zeros) but are not followed by a non-zero digit are significant. For example, there are 5 significant digits in 22.300.

Rule 6: The final zeros in a whole number may or may not be significant. It depends on how the estimation is made.

Significant Figures

A point to remember is that the number of digits is used to denote an exact value to a specified degree of accuracy. For example, 6084.324 is a value accurate to 7 significant figures. If written as 6080 it is accurate to 3 significant digits. The final 0 is not significant because it is used to show the order of magnitude of the number.

Significant Figures

List of Inferential Statistics and Description

Learn R Programming Language

Percentages, Fractions, and Decimals Made Easy

by

Percentages, Fractions, and Decimals are connected. Percentages, fractions, and decimals are all different ways to represent parts of a whole. They can be converted between each other, which is useful for solving many mathematical problems.

We often see phrases like

  • up to 75% off on all items
  • 90% housing loan with low-interest rates
  • 10% to 50% discount advertisements

Examples of Percentages, Fractions, and Decimals

These are some examples of percentages.

Suppose, there are 200 students in a college. Let 80 students remain in college to participate in college extra-curricular activities (ECA). The fraction of students who participated in college ECA can be written as $\frac{80}{100}$, or $\frac{40}{100}$, or $\frac{2}{5}$. We can read it as 80 out of 200 students participated in ECA (or 2 out of 5 participated in ECA). Multiplying this fraction with 100 will convert the fraction to percentages. Therefore, 40% of the students participated in ECA.

By percent means that for every hundred or out of every hundred.

Therefore, a percentage is a fraction whose denominator is always 100. Therefore, a percentage can be converted to a fraction by dividing it by 100. Alternatively, one can change a fraction or a decimal to a percentage by multiplying it by 100. The following figure is about the conversion cycle of percentages to fractions or decimals and vice versa.

Percentages, Fractions, and Decimals

Real-life Examples of Percentages, Fractions, and Decimals

Suppose, you are told that 70% of the students in a class of 50 passed a Mathematics test. How many of them failed?

Number of Students passed the Mathematics test = 70% of 50 = $\frac{70}{100}\times 50 = 35$

Number of students who failed the Mathematics test = $50 – 35 = 15$.

The number of students who failed can be found in an alternative way

\[(100-70)\%\times 50 = \frac{30}{100}\times 50 = 15\]

Statistics Help

SPSS Data Analysis

Online MCQs Quiz Website

How to Fix Instagram Story Video Quality Blurry Problem

by

The quality of your video is too bad after uploading to Instagram Story? In this article, we will tell you why the video on Instagram Story is blurry, and how to fix Instagram story video quality.

FlexClip: Fix Instagram Story Video Quality

If you are a longtime Instagram user, you will realize the importance of video/ photo quality on Instagram. However, on social networks, you see a lot of people complaining about topics like this.

“My videos became of poor quality after uploading them to Instagram. There is no problem with the video. Why and how do I fix this problem? ”

Poor quality video on Instagram Stories can occur for many reasons, including Internet connection, and app version. Whatever it is, the problem of poor-quality Instagram story videos is not difficult to solve. Follow the methods below and say no to blurred Instagram video stories. The methods below can be used to fix Instagram story video quality.

Ways to Fix Instagram Story Video Quality Problem

1. Check Internet connection

If your Internet connection is unstable, uploaded Instagram videos may be blurred because they have not been fully loaded. While you are uploading a video to Instagram with a poor Internet connection, Instagram will automatically reduce the quality of the video for upload. Try to connect your device with a stable WIFI adapter to mobile data.

2. Try different videos and images

Recovered your phone from a backup? Try a different video or photo. The clarity of photos and videos can change in the damaged backup.

3. Reset network settings

On an iPhone, to reset network settings, you have to go to Settings> General> Reset> Reset Network Settings. On an Android phone, you need to go to Settings> Backup and reset> Reset Network Settings.

4. Adjust camera settings

When your phone is unable to record high-quality video, here’s what you do to adjust your phone camera settings.

On Android:

Step 1:  Open the default Camera app on your phone.

Step 2:  Click the Settings icon shaped like a gear icon.

Step 3:  Adjust the image and video size to the highest quality.

On iPhone:

Step 1  Launch the iPhone Settings app on your phone.

Step 2  Find Camera.

Step 3  Adjust camera quality and turn on “Automatic DHR”.

5. Picture and video size is not the correct aspect ratio

Instagram limits the size and quality of the photos and videos you upload. If you’re uploading a video or photo that’s too large, Instagram compresses it so your video loads faster. One solution is to not use the phone’s camera. Use Instagram’s camera instead. No cuts and no quality loss.

6. Update the application

When you’re on an older version of Instagram, Instagram Story videos may appear worse. Update it so you can enjoy your new Instagram journey.

7. Adjust Instagram settings

Instagram burns your mobile data. To prevent you from misusing your data, Instagram gives you a setting to keep your mobile data usage to a minimum. This will dramatically decrease the quality of your Instagram feed. Here’s what you do to disable this setting.

Step 1:  Launch Instagram and tap on your profile icon.

Step 2:  Click on the three horizontal lines.

Step 3:  Go to Settings> Accounts> Cellular Data Usage.

Step 4:  Turn off Data Saver.

8. Use a photo/video editing app

Instagram has certain requirements for videos and photos. If the video you want to upload doesn’t meet the requirements, Instagram will automatically trim or compress it.

Lots of video editors like FlexClip help you crop and compress videos to fit Instagram story format without losing video quality. In clicks, you can adjust the aspect ratio, video length, and video size.

Moreover, it also gives you other video editing tools for video upscaling, like transitions, filters, and video speed changers. Last but not least, FlexClip has a ton of media resources that you can apply, including video clips, photos, music, and even royalty-free pre-made video templates.

FlexClip: Fix Instagram Story Video

Conclude

With 8 solutions to poor-quality video processing on Instagram stories, you will no longer experience blurred Instagram video stories! Share this post if you found it helpful to fix Instagram story video quality.

Convert Documents to PDF, doPDF

R Programming Language

RecordCast – Recording the Screen in One Click

by

A tutorial about RecordCast: Screen Recording Tool.

Have you ever made video tutorials? Have you ever recorded your computer screen? Indeed, many tutorials are done from the video of a computer screen. This enables Internet users to follow the various steps to follow to resolve a problem or use new software. If you want to instantly record the actions you take in a desktop window without sharing or recording information from your computer, the free online RecordCast‌ Screen Capture tool (RecordCast – Recording the Screen) is what you are looking for!

RecordCast - Recording the Screen

What is RecordCast?

It is a simple web-based tool to record or capture your screen without using third-party apps. All records are processed in the browser, and nothing is saved on the server. It is supported in modern browsers like Chrome, Edge, Firefox, and more.

RecordCast – Recording the Screen is very easy to use, with the essential ability to record everything that happens on our screen, with or without sound. After recording, you can edit the created video, adding text (it has several templates for entering text), images, audio, etc. You can also cut the video and isolate the pieces you want or do not want.

RecordCast

How RecordCast Screen Recorder works

  • Open your browser and go to the service.
  • All you have to do now is click on the “start recording” button in the center.
  • You can choose the type of recording you want, including screen+webcam, screen only, or webcam only.
  • It is possible to record microphone, system audio, or mute audio while recording your screen.
  • After allowing or forbidding the recording, you can make the necessary settings of the recording media available to start your screen’s recording process.
  • You now have three options: select the entire screen, the application window, or the Chrome tab. If you select an application window, the service will show all open windows. If you select a Chrome tab, all open tabs will be displayed in the list.
  • After selecting an app or screen, tap on the record button.
  • After you’ve finished recording, you will have the option to load the recording or start a new recording by deleting the clip.
  • It is available to edit the recorded video in a built-in editor provided by RecordCast, but you need to create a free account now.
RecordCast

In conclusion

RecordCast – Recording a Screen is a great tool for YouTubers, bloggers, and presentations as it gives you everything you need to make a cool show. Some cool features of RecordCast are free, and you can connect a microphone to comment on your video or a webcam, where you can be seen while you are filming.

The only minus we could find about the program is that it only allows you to film for 30 minutes now, which can feel like a very short time. However, the program is good to use if you are inexperienced in making screenshots, as it is incredibly easy to use. In addition, the quality of the recording itself is also really good.

Of course, there are other free web-based screen capture programs, but I do not have enough hands-on experience with them to comment on them. Is RecordCast something you can use? Do you know other and better alternatives? I would love to hear what you think, so leave a comment and make us all smarter!

SPSS Data Analysis

Online MCQs Quiz Website