Secondary StatZing! newsletter

Agriculture and horticulture - secondary teachers page

Analysis of time series for level 3 - teachers page

Archived secondary StatZing! newsletter

Balance of payments - teachers page

Case datasets - teachers page

Census information secondary - teachers page

2001 Census Education Resource Kit

Comings and goings - teachers page

Consumers Price Index - teachers page

Creating your own survey- teachers page

Data about my Region - teachers page

Drift to the north - teachers page

Future population growth - teachers page

Gender and jobs - teachers page

Geography tables - teachers page

Heating fuel in New Zealand - teachers page

Household Spending Activity two-teachers page

Incomes and spending - teachers page

Ins and outs of water - teachers page

Internet access - level 1 teachers page

Interpreting statistics - teachers page

Males versus females - teachers page

Measuring employment - teachers page

Measuring nominal GDP - teachers page

New Zealand's hospitality industry

Our ageing population - teachers page

Overseas trade - teachers page

Residuals and R squared for teachers

Social studies unit plans

SURF for Schools

Te ahua o nga Iwi me nga kura o te motu ta nga kaiako

Te Kete Tatauranga

Time series for marriages - level 3 teachers page

Time series - teachers page

Who lives in this area? Ko wai e noho ana i tenei rohe for teachers

Print version

Money for nothing

Problem

You have been hired by a large company to investigate the hours worked per week by their employees. The company is concerned that it has too many employees who do not work a 40-hour week. The information is available from the company’s database. The data on hours worked includes both full-time employees, and school and university students who work part time.

You need to take a sample of 35 employees from this database to calculate an estimate of their hours worked per week.

a) Choose a suitable sampling method and use it to design a sampling process. Describe this process so that someone else could follow it, and justify why you chose this method.

b) Use your sampling method to select a sample 35 employees. Explain whether your sample is representative of the whole population or not.

c) Calculate appropriate sample statistics and draw appropriate statistical graphs.

d) Use these statistics and graphs to write a justified conclusion about the hours worked per week for the company’s employees. What have you found out about employees hours of work? Is the company’s concern valid?

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Page last modified on Friday, 23 February 2007

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