There is a regular bus service between Hometown and Jobtown; the fares are given in the table below. Type of journey Fare Day return: Monday to Friday $5.00 Day return: Saturday and Sunday $4.00 Single: any day $2.80 5-Day Special: any number of journeys on 5 consecutive days starting on a Monday $22.60 28-Day Special: any number of journeys on any 28 consecutive days $115.00 Joanna lives in Hometown and works and shops in Jobtown. She works Monday to Friday and shops every Saturday. She travels by bus, except that a colleague gives her a lift home from work every Friday. Joanna also travels on the bus to visit a friend in Jobtown on every other Sunday. Joanna wants to keep her travel costs as low as possible. How much will Joanna spend on bus fares during a period of four weeks?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.