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What is the probability of picking an odd numbered house in a street with houses numbered from one to seven?
4/7
Why do houses have numbers on the outside of the house?
In order to deliver mail, carriers needed a way to identify houses from the outside. A simple number system was developed using even numbers on the left side of the street/road and odd numbers on the right side of the street/road. Numbers had to be posted prominently, near the front door (most doors had mail slots back then). Later, fire and police services required large reflective numbers on all houses.
Why are there even house numbers on one side of the street and odd numbers on the other side?
No specific reason - and they don't always follow that pattern... There are many streets in the UK that have sequential numbers on one side, continuing on the other. This can happen when a row of houses is built next to private land.
Is systematic sampling biased?
Often not, but it is important to check that there is no systematic pattern in the skip.To take an unlikely example, suppose you wanted to sample the values of 10% of houses on a street with 200 houses on it. A possible systematic sampling scheme would be to select a random house number to start with and then select every 20th house number (looping back when the number exceeds 200). If the first house number is odd then all houses in the sample are odd numbered and, therefore, on the same side of the street. If the street runs East-West, the sample could consist exclusively of South-facing gardens - attracting a price premium!
How do you get the percent of this 30 houses on the street 24 have pumpkins what percent do not have pumpkins?
24 houses have pumpkins. 6 houses don't have pumpkins. 24/30 = 80% have 6/30 = 20% have not
