Three brands of petrol were compared on five makes of car. Table below shows the kilometers travelled in each case, on a standard amount of petrol under similar conditions. Petrol brand
Make of car
A B C D E

1
2
3
31.0 33.5 28.0 40.1 34.1
29.5 31.4 25.0 30.2 32.1
22.7 32.1 26.4 29.8 30.1

Required: Carry out the analysis of variance (ANOVA) and test, at the 5% level of significance, for differences between makes of car and between brands of petrol.​

Select the correct answer. emma, the quality control manager in a software development company, asks the testing team to check whether the user interface is friendly. to which type of testing is emma referring? a. usability testing b. data comparison c. validation testing d. stress testing e. destruction testing

In a heat transfer course, we can derive the equation for the temperature distribution in a flat rectangular plate. in this example, we will look at a plate at steadystate with three sides being held at t1, and one side held at t2. the temperature for any location on the plate, t(x,y), can be calculated by where create a function (prob3_5) that will take inputs of vectors x and y in feet, scalar n, scalars l and w in feet and scalars t1 and t2 in degrees fahrenheit. it will output a matrix t which is the temperature of each x and y locations. t will have the number of columns equal to the number of elements in x and rows equal to the number of elements in y. though this can be done without loops (perhaps more efficiently), your program must use a nested loop.

Looking at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way