How to calculate variance?

Lucas and Michael conduct a study to determine if drinking Gatorade, Powerade, or a Monster energy drink causes one to run faster in a 100 meter dash. They recruit 100 athletes and randomly assign each athlete to drink 16 ounces of Gatorade, Powerade, or a Monster energy drink. They then measure how fast the run the 100 meter dash. What type of test should they conduct? Correlation/Regression Independent t-test One-way ANOVA Dependent t-test

onsider the following data: x 3 4 5 6 7 P(X=x) 0.2 0.1 0.2 0.1 0.4 Step 2 of 5 : Find the variance. Round your answer to one decimal place.

-Please do on excel and write the excel fomula for each answer you give. I cannot figure this question out.  A business school has a goal that the average number of years of work experience of its MBA applicants is more than three years. Historical data suggest that the variance has been constant at around six months, and thus, the population variance can be assumed to be known. Based on last year’s applicants, it was found that among a sample of 47, the average number of years of work experience is 3.1. Can the school state emphatically that it is meeting its goal? Formulate the appropriate hypothesis test and con-duct the test.

What is the Weakness of Variance?

An engineer wants to determine how the weight of a gas-powered car, x, affects the gas mileage, y. Would it be reasonable to use the least-squares regression line to predict the miles per gallon of a hybrid gas and electric car? Why and why not?

Coefficient of determination is the square-root of the coefficient of correlation. Select one: True False

ANOVA looks at both between subjects and within subjects variance. Looking at variance in one condition (for example, everyone who drank espresso shots) is:   which one below? Within subjects variance Internal variance All variance Between subjects variance

Textbook: Statistics for the Behavioral SciencesGregory J. Privitera Please show your work-Concept and Application Problems (Pg.133) 1. If Sample 1 has a variance of 4 and Sample 2 has variance of 32, can we tell which sample had a larger range? If so, which sample had a greater range?

Why is the concept of variability important?