Questions from Statistical Techniques

Q: Return to the variables used in Chapter 9, Exercise 3.

Return to the variables used in Chapter 9, Exercise 3. In that exercise you were required to obtain a trend for each variable using moving averages. For each trend that you obtained, forecast the tren...

Q: In the worked example we analyzed the relationship between per capita income

In the worked example we analyzed the relationship between per capita income and consumers’ expenditure on Food & Drink. Table 10.17 shows consumers’ expenditur...

Q: A small engineering company has been monitoring its total costs over the

A small engineering company has been monitoring its total costs over the last few years on a quarterly basis together with the number of employees and production level. In order to assist the company...

Q: The corporate planning department in a large brewing company has been trying

The corporate planning department in a large brewing company has been trying to develop a medium-term forecasting model relating to the demand for one of their products: a low-alcohol lager. The metho...

Q: As manager of a local leisure centre you are investigating the frequency

As manager of a local leisure centre you are investigating the frequency of use of the centre by its members. You hope that by understanding some of the key factors that influence how often members us...

Q: Next week you have to travel around parts of the country on

Next week you have to travel around parts of the country on business and have decided to hire a car from a car-hire company. You have contacted two companies which offer different services. The first...

Q: A large retail organisation has a number of home-furnishing outlets

A large retail organisation has a number of home-furnishing outlets in a particular region, selling products such as carpets, curtains, domestic furniture and fittings. The organisation has been affec...

Q: A training agency is currently reviewing part of its operations. It

A training agency is currently reviewing part of its operations. It runs one particular scheme whereby young people who are unemployed are put through a training course which provides them with a vari...

Q: A senior police manager is reviewing manpower allocation of police officers to

A senior police manager is reviewing manpower allocation of police officers to a number of geographical districts which fall under her responsibility. Data has been collected on a number of variables,...

Q: Return to the unit sales data used in this chapter. Apply

Return to the unit sales data used in this chapter. Apply the exponential-smoothing model to this data using values for a of 0.15, 0.2, 0.25 and 0.3. Assess the accuracy of each choice of a and decide...