Understanding an ANOVA.

What and how do you run an Anova?

Levels of data, measures of central tendancy, dispersion and distribution.

What are levels of data and central tendancy? How is the standard deviation and semi-interquartile range calculated?

Find Standard Deviation using the computational formula

"My Bank" opens a branchin a commercial district. The bank wants to find out the waiting time of their customers during the Friday evening hours from 5pm to 8pm. Accordingly, the waiting time is recorded for all customers during these hours over a month. A random sample of 20 customers is selected; the waiting time, in minutes, is shown below: 9.50 5.0 8.02 6.00 3.40 8.33 8.35 10.49 5.32 4.08 9.20 5.40 6.17 3.00 2.32 8.35 8.02 6.00 5.15 9.00 Using the data in ungrouped form, compute the Standard Deviation, using the computational formula.

Construct a Frequency Distribution with a class interval of 10, starting with 30.

The caffeine content of 20 brands of regular coffe is shown below. 80 82 89 85 87 30 33 44 40 46 50 55 60 62 71 90 92 75 63 65 Construct a Frequency Distribution with a class interval of 10, starting with 30. Show the class limits, class boundaries, class midpoints, class frequencies and class cumulative less than frequencies.

Explanation of the four scales of measurements e.g., nominal, ordinal, interval and ratio

In determining the value of a variable, four scales of measurements are used. Describe these scales of measurements and provide examples.