One item on a questionnaire asks students how many times per day in a typical week they make a call on their cell phones. The responses for a sample of n = 12 students are summarized in the frequency distribution. What is the best measure of central tendency for these data? X f ​ 5+ 5 ​ 4 4 ​ 3 1 ​ 2 0 ​ 1 2 ​ 0 0 ​

To determine the size of a difference between two individuals on a measured variable, a researcher must use either an interval or a ratio scale of measurement.

A researcher surveys a sample of n = 20 college students and asks each person to identify their favorite movie. If the data were organized in a frequency distribution table, what would be included in the last column?

In a grouped frequency distribution table, scores range from X = 15 to X = 52 with class interval widths of 5. The bottom class interval should be 15-19..

It is possible for the value of the median to be greater than the value of the mode.

For the following distribution of quiz scores, what is ΣX? ​

What happens to the field of view as the magnification decreases? [a]   Which picture represents the largest field of view? [b]

Which picture is a negative control? [a] This tests for [b].

If a puppy has a mass of 1,800 grams. How many kilograms is the puppy? [a] If a glass has a volume of 473 milliliters, what is its volume in liters? [b]  

Which tube contains starch? [a] What is the name of the test pictured? [b]