Gabriel Allred

Gabriel Allred

The University of Texas Health Science Center at San Antonio

Statistics teacher | Verified Expert

With a Statistics major from The University of Texas Health Science Center at San Antonio, my passion lies in demystifying numbers and fostering a deep understanding of mathematical concepts. As an experienced tutor, I excel in breaking down complex statistical theories into digestible bits, empowering students to conquer any data-related challenge. My approach focuses on personalized guidance, tailored to individual learning styles, ensuring every student reaches their full potential. Let's embark on a journey of statistical mastery together.


  • Can the standard deviation ever be negative?
  • A random sample of 44 eight-ounce servings of different juice drinks has a mean of 79.8 calories and a standard deviation of 49.3 calories. How do you construct the sample's 90% and 95% confidence intervals?
  • Why does the margin of error decrease as the sample size #n# increases?
  • What are the Independent and Dependent variables in the following statement?
  • A used car dealer is examining how the price at which a car can be sold varies with the car's mileage. What is the independent variable in this relationship?
  • How do you evaluate #""_8C_5 * _7C_3#?
  • If X and Y are uncorrelated variables, what is Var(X+Y) in terms of Var(X) and Var(Y)?
  • A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that one or the other will fail?
  • How many subsets are in the set {math, English, history, science}?
  • What is the slope of the regression line?
  • How is an outlier identified on a residual plot?
  • What is the variance of {15, 9, -3, 8, 0}?
  • 5 letters in each of 3 rings of a lock are printed. If the lock can be opened by only one permutation of three letters, then find the number of permutations by which the lock cannot be opened? ps: by locks it meant those locks we have in ourbriefcase
  • What are the limitations to using R-Squared as a measure of the validity of a model?
  • What are the imortant characteristics of a pie chart?
  • For what statistical analyses can you determine an R-Squared?
  • If a player has scored Runs - 45,55,25,35,5,15 in No of matches 40,30,30,50,10,20 respectively, what is the median score of the player?
  • What information does an ogive provide?
  • What is a relative frequency distribution?
  • What information is gleaned if we reject the null hypothesis for the test of the slope of the least squres regression line?