Joseph Mburu
Joseph is an experienced Statistician and Data Analyst with over six years of hands-on work in applied statistics, data science, and quantitative research. He holds advanced degrees in Applied Statistics and Data Analytics, reflecting strong technical and academic expertise. Joseph is the founder of Stat Study Hub, a platform designed to help students, researchers, and professionals understand statistics through clear explanations, interactive calculators, and practical examples. Known for a friendly, step-by-step teaching approach, he is committed to making statistics simple, accurate, and usable for everyone.
Latest Articles by Joseph Mburu
How to Calculate Binomial Probability (Step-by-Step with Examples)
November 12, 2025
Binomial probability shows the chance of getting a certain number of successes in a fixed number of trials. Each trial has only two outcomes: success or failure. For example, it can help you find the chance of getting three heads in five coin tosses. It can also show the chance of finding two defective bulbs […]
Read MoreMean of Binomial Distribution
November 5, 2025
The binomial distribution is a common discrete probability distribution model used to describe situations with repeated trials and two possible outcomes. Many students search for the “mean of binomial distribution” because they want a clear understanding of how to find the expected number of successes in such experiments. The mean offers a simple way to […]
Read MoreZ Critical Value in Excel
November 4, 2025
After performing a z-test, the next step is deciding whether to reject the null hypothesis. This decision is based on the z critical value. If the absolute value of your z-test statistic exceeds the z critical value, you reject the null hypothesis. Otherwise, you fail to reject the null hypothesis. While you can find the […]
Read MoreZ Score: Definition, Formula, Calculation & Interpretation
November 4, 2025
A z score is a statistical measure that shows how many standard deviations a value is from the mean of a dataset. Simply stated, a z score tells you whether a number is above or below the average and by how much. For instance, if you scored 85 on a test where the average was […]
Read MoreHow to Find Probability From Z Score using Z Tables
November 3, 2025
In statistics, a z-score shows how many standard deviations a value lies from the mean. It helps identify whether a score is above or below average. Understanding how to find probability from a z-score is essential because it reveals how likely a value is to occur within a standard normal distribution. This concept is widely […]
Read MoreZ score in Excel
October 31, 2025
In statistics, a z-score is a standard score that indicates how many standard deviations a data point is from the mean. For instance, a z value of -2 means that the data point is 2 standard deviations below the mean. To find the z-score value manually, we use the following formula: z=(x−μ)/σ Where Besides applying […]
Read MoreSample Size Determination in Research: Cochran’s, vs. Slovin’s vs. Yamane’s Formula
October 11, 2025
Determining the right sample size is one of the most important steps in any research design. It helps ensure that the results you get truly represent the whole population without wasting time or resources. Sample size determination simply means finding out how many people or items you need to include in your study to get […]
Read MoreHow to Find Z Critical Value From Z Tables
October 5, 2025
Understanding how to find a z critical value is an important step in statistics, especially when constructing confidence intervals or performing hypothesis tests. A z critical value shows the cutoff point on a standard normal distribution where results become statistically significant. In this post, you’ll learn a simple, step-by-step method to find z score critical […]
Read MoreWhat is a Binomial Distribution?
September 19, 2025
The binomial distribution is one of the most important ideas in probability and statistics. It describes situations where there are only two possible outcomes, such as success or failure, win or lose, or yes or no. This makes it very useful for studying real-life problems like coin flips, medical trials, or customer choices. Understanding the […]
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