Centrifugal is a bike rental company operating in the UK. Centrifugal have two main customer groups:

• Members who pay a monthly subscription fee and can use the bikes as often as they like during the month
• Casual Riders who pay on per ride basis.

Data on the total number of rides over the past six months was collected and can be found on the Centrifugal Worksheet.

Last year the average number of daily Casual Rides was 500. Centrifugal has since increased promotion of their casual service. Conduct a test at the 10% level of significance to determine if the average number of casual riders has increased since then.

Week Day Total Bike RidesCasual Rides Member Rides