Task 1

Solve an engineering problem using routine central tendancy, dispersion and distribution operations. (P5)

Task 1.1

The following values of h_FE were measured from a sample of 25 small signal transistors taken at random from a batch of transistors manufactured on the production line of a semi-conductor company:

291, 302, 305, 299, 314, 285, 296, 302, 293, 307, 310, 298, 300, 305, 394, 308, 301, 312, 284, 297, 299, 303, 308, 295, 299

For the above sample, calculate correct to two decimal places:

1. Three different measures of central tendency
2. Range
3. Standard deviation
4. Variance

Task 2

Solve an engineering problem using routine linear regressionoperations. (P6)

Task 2.1

In an experiment to determine the relationship between frequency and the inductive reactance of an electrical circuit, the following results were found:

Frequency (Hz)	50	100	150	200	250	300	350
Inductive reactance (Ohms)	30	65	90	130	150	190	200

By showing these values on a suitable graph, determine the equation of the regression line of inductive reactance on frequency, assuming a linear relationship is present. State your result in standard linear format.