statisticsfundamentals

Welcome to your statisticsfundamentals

The empirical rule is commonly used in which branch of statistics?

The distribution of returns on U.S. bonds (a conservative investment) would be best described as:

The graph below is most accurately described as being:

Which visualization is useful for visualizing the correlation between two variables?

When comparing two samples of different sizes in Excel, which option should you select from the Data Analysis tool?

A company has an NPS score of 42. The scores have a variance of 125. What is the standard deviation?

When conducting a hypothesis test, the sample size needed can vary based on the population you are studying. However, as a rule of thumb, what is the minimum sample size we should use for a one-tail or two-tail test?

The Central Limit Theorem tells us _________ trends towards ________ as our sample size grows.

The alpha value is equal to _____________ and describes the expected rate of _________.

The beta value is equal to _____________ and describes the expected rate of _________

How can we reduce the chances of a type I error (false positive)?

Which of the following are examples of p-hacking? (Select all that apply).

Conduct a t-test. Use the data provided in the 04-Exam-ABTest-Data.csv. Your confidence level for this test will be at 95%. What is the p-value for our test?

Our confidence level is 95%. Based on the results of our t-test, how will we conclude our test?

The difference between our samples is statistically significant. To describe the effect size of the new branding, we decide to run the Cohen's d calculation. Using the results of the test and the standard deviation of our old branding, calculate the effect size. Which of the following best describes our effect size?

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