A researcher wants to examine whether the size of the font of test questions affects scores on a test. The researcher gives 200 undergraduate students the same test, except that half of the students receive a test printed in size 10 font and the other half of the students’ exams are printed in size 14 font. What type of design is this?

Assume the existence of a bankaccount class. define a derived class, savingsaccount that contains two instance variables: the first a double, named interestrate, and the second an integer named interesttype. the value of the interesttype variable can be 1 for simple interest and 2 for compound interest. there is also a constructor that accepts two parameters: a double that is used to initialize the interestrate variable, and a string that you may assume will contain either "simple", or "compound", and which should be used to initialize the interesttype variable appropriately. there should also be a pair of functions getinterestrate and getinteresttype that return the values of the corresponding data members (as double and int respectively).