Statistical Analysis Flashcards
6 cards from real Data and Analytics practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Statistical Analysis flashcards as text
What does the p-value represent in hypothesis testing?
Answer: The probability of observing results as extreme as the data if the null hypothesis is true
The p-value is the probability of obtaining results at least as extreme as observed, assuming the null hypothesis is true.
What is the mean of the dataset: 4, 8, 6, 10, 12?
Answer: 8
The mean is calculated as (4+8+6+10+12)/5 = 40/5 = 8.
What does standard deviation measure?
Answer: The average distance of data points from the mean
Standard deviation quantifies the dispersion of data points around the mean, measuring how spread out values are.
What type of correlation does a Pearson coefficient of -0.85 indicate?
Answer: Strong negative correlation
A Pearson coefficient of -0.85 indicates a strong negative linear relationship where one variable increases as the other decreases.
What is a Type I error in hypothesis testing?
Answer: Rejecting a true null hypothesis
A Type I error (false positive) occurs when a true null hypothesis is incorrectly rejected.
Which measure of central tendency is most resistant to outliers?
Answer: Median
The median is the middle value when data is sorted, making it unaffected by extreme outlier values unlike the mean.