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Mathematics, 21.04.2020 17:24, Crxymia
7.28 Helmets and lunches. The scatterplot shows the relationship between socioeconomic status measured as the percentage of children in a neighborhood receiving reduced-fee lunches at school (lunch) and the percentage of bike riders in the neighborhood wearing helmets (helmet). The average percentage of children receiving reduced-fee lunches is 30.8% with a standard deviation of 26.7% and the average percentage of bike riders wearing helmets is 38.8% with a standard deviation of 16.9%. (a) If the R 2 for the least-squares regression line for these data is 72%, what is the correlation between lunch and helmet
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Mathematics, 22.06.2019 00:30, sanfordl
1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?
Answers: 2
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Mathematics, 22.06.2019 01:10, ljdavies51
Use a standard normal table to determine the probability. give your answer as a decimal to four decimal places. −1.5< < 1.5)
Answers: 3
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7.28 Helmets and lunches. The scatterplot shows the relationship between socioeconomic status measur...
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