# 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

- As of November 30,2014, there was 4364 Walmart stores in the U.S and 6193 outside of the U.S. Are the number of Walmart stores discrete or continuous? Why?
- Two cards are chosen at random from a deck of 52 cards. What is the probability of getting a diamond, replacing the card, then getting a red jack?
- How do you find the median of 4 numbers?
- Of 100 gumdrops 73 are large, 39 of them are red, and 19 are large and red. If you choose a random gumdrop, what is the probability that it is red? If the gumdrop is red, what is the probability that it is large?
- In a statistics class of 100 students, the mean score on the midterm was 98. In another class of 23 students, the mean score was 8. What was the mean score of the two classes combined?
- What does it mean if P(A|B) = P(A) and P(B|A) - P(B)?
- What is the median for the following data set: 10 8 16 2 100
- If A and B are mutually exclusive, what is P(A|B)?
- Two events A and B are such that #P(A)=.2, P(B)=.3,# and #P(AuuB)=.4#. What is #P(AnnB)#?
- How do you find the geometric mean for the pair of numbers: -18, -36?
- Is the following distribution a discrete probability distribution? If not, why?
- One letter tile is randomly drawn from a set of 26 alphabet tiles representing letters A through Z. What is the probability that the letter drawn is a vowel or is in the word “now”? Give your answer as a fraction in reduced form.
- In how many different ways can the 9 starters of a baseball team be placed in their positions?
- The purpose of measures of central tendency is to describe the variability within a data set. Is this true or false? Why?
- Why are measures of central tendency essential to descriptive statistics?
- What is the five-step process for hypothesis testing?
- How do I find the average of $36,995, $32,507, and $37,286?
- How does hypothesis testing related to confidence intervals?
- Katie must take five exams in a math class. If her scores on the first four exams are 76, 74, 90, and 88, what score must Katie get on the fifth exam for her overall mean to be at least 70?
- The faces of a number cube are numbered 1 through 6. Event A = rolling a 2, 4, or 6. What is the complement of event A?