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?