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2) - Sample = 60 customers whose service times were...

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Statistics 5e 4/02/08 Summarize Numerical Data: Graphical summary – histogram Numerical summary Ex: In order to decide on the number of cashiers to employ, Goleta Coffee House decides to obtain information on the length of time required to service customers who are from Goleta. To obtain the information on the distribution of customer times, a random sample of 60 customers service times were recorded. There are six blocks Use open-ended classes The upper limit on each class is not included (don’t include 1,2,3,4,5,6) 45% of observations are in the 2 nd class or bar. About 45% of store customers are required between 1 and 2 minutes to be served. A) What proportion of customers are served in less than 2 minutes? 45+38 = 83% B) What is the population and what is the sample? Population = All potential customers from Goleta
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Unformatted text preview: Sample = 60 customers whose service times were recorded ( from Goleta) Chapter 3: • Numerical summaries (measures) for the population and the sample • A population parameter is a numerical measure for the population • A sample statistic is a numerical measure for the sample (measure of center) • The mean is the sum of all values (X1+X2+X3+…XN) divided by the number of values • The median is the middle number when the values or measurements are arranged in ascending order. If the number of values or measurements is even, then take the average of the two middle numbers. • (Outliers: values that are much smaller or larger than the majority of the data) • The mode is the value that occurs the most (ex: 1,2,2,3,4 mode = 2) 5 10 15 20 25 30 35 40 45 1 2 3 4 5 6 Percentages...
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