# Oliver Aldrich

Washington & Jefferson College

Statistics

Statistics teacher | Experienced educator in USA

I'm a Statistics graduate from Washington & Jefferson College, passionate about unraveling the intricacies of data and its real-world applications. With a solid foundation in statistical theory and methods, I thrive on helping students grasp complex concepts with clarity. Whether it's probability theory, regression analysis, or data visualization, I'm dedicated to fostering a deep understanding and appreciation for the power of statistics. Let's embark on a journey to demystify numbers together and unlock their potential in various fields.

## Questions

- Can t-test statistic have a negative number?
- What is the best approximation of the standard deviation of #{10,15,20,25,30}# - #5,7.5# or #10#?
- What is the raw score of a value if the mean = 1530, standard deviation = 1754, and z-score = 3.45?
- If coefficient of correlation, “r” between two variables is zero, does it mean that there is no relationship between the variables?
- How do you use the z-score to determine #P(0<z<0.94)#?
- What is another name for a boxplot?
- What is the probability that the sum of two dice rolls is 12 if the sum is even?
- The probability of having a toothache because of a cavity is 0.8. Suppose the probability of having a cavity is 0.05. Assuming the probability of a toothache given you have no cavity is 0.01, what's 'the probability of a cavity if you have a toothache?
- What is ANOVA used for?
- Assume that a normal distribution has a mean of 21 and a standard deviation of 2. What is the percentage of values that lie above 23?
- How would you explain the analysis of variance?
- What is the 90th percentile of a standard normal distribution?
- Let's say that the spread of possible outcomes is 1 to 40. The mean is 20.5. The probabilities create a perfect bell curve. The standard deviation is 3.4. What is the probability of getting a number from 21 to 40?
- What is the area under the standard normal probability distribution between z = 0 and z = 2.08?
- Let #X ~ N(4, 16)#. How do you find #P(X > 0)#?
- How do you write an algebraic expression for: the number of sheep should not be more than 4?
- What is the difference between modal and median value of the following set: {20.0, 20.4, 21.6, 20.8, 22.2, 19.4, 20.6, 21.3, 19.0, 20.6, 19.9, 19.3, 20.3, 20.9, 20.1, 19.5}?
- If Debbie has 3 blouses and 4 skirts, how many different outfits of a blouse and skirt can she wear?
- If the probability of a frost tomorrow is 0.05, what is the probability of not having a frost?
- From 8 names on a ballot, a committee of 3 will be elected to attend a political national convention. How many different committees are possible?