


Hunter Aldridge
Statistics teacher | Tutor for 5 years
I earned my Statistics degree from Seminole State College of Florida. Equipped with a deep understanding of data analysis and interpretation, I'm here to guide you through the world of numbers. From probability theory to hypothesis testing, I'm committed to helping students grasp complex statistical concepts with clarity and confidence. Let's work together to unlock the mysteries of data and excel in your academic journey.
Questions
What is the z-score of sample X, if #n = 81, mu= 43, St. Dev. =90, and E[X] =57#?
What is a pooled variance?
How many permutations are there of the letter in the word baseball?
How can you use the ANOVA to reject a null hypothesis? How is it related to the F-critical value?
When #n=20# and #p=.2#, what is #P(X <= 12)#?
If P(A)=1/4,P(B)=1/3 and P(A∪B)=1/2 find the values of 1. P(A∩B) 2. P(A∩B') 3. P(A'∩B') ?
Can a z-score be negative?
How do you find the p-value of a two tailed test when z = 1.95?
Why must the R-Squared value of a regression be less than 1?
A lottery claims that 10% of tickets win a prize. How many tickets should you purchase to be more than 50% sure of winning a prize?
A banker finds that the number of times people use automated-teller machines in a year are normally distributed with a mean of 40.0 and a standard deviation of 11.4. What is the percentage of customers who use them less than 25 times?
If two dice are rolled, what is the probability that the sum of the dice is 10?
What is the mathematical formula for calculating the variance of a discrete random variable?
How can the median be the greatest number in a set?
How do you find the mean of the following set of numbers: 12, 14, 16, 12, 13?
- A sample of 25 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is 384. Why is it 384?
- License plates are made using 3 letters followed by 2 digits. How many plates can be made if repetition of letters and digits is allowed?
- John is going to pack 2 T-shirts for basketball practice. He has 2 White shirts, 3 blue shirts, 1 green shirt, and 3 black shirts in her drawer. If John chooses the 2 shirts at random, What is the probability that he will pack 2 blue T-shirts?
- What does a small standard deviation signify? What does a large standard deviation signify?
- A population has a mean of μ = 100 and a standard deviation of σ = 10. If a single score is randomly selected from this population, how much distance, on average, should you find between the score and the population mean?