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A large airline wants to estimate its average number of unoccupied seats per flight over the past year. To accomplish this, the records of 30 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The data is tabulated below.
8 18 13 11 22 14
9 18 10 18 13 15
7 16 11 10 20 19
13 16 19 18 22 23
6 15 11 12 18 12
Give a 90% confidence interval for the average number of empty seats. Use the sample standard deviation rounded to 3 decimal places. Put your answers in (a, b) form with parentheses and space after the comma required. Round your answers to two decimal places!
In a study of smokers who tried to quit smoking with nicotine patch therapy, 39 were smoking one year after the treatment, and 32 were not smoking one year after the treatment.
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The following ANOVA table was obtained when estimating a multiple regression model.
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A city's mean minimum daily temperature in February is 27 degrees F. Suppose the standard deviation of the minimum temperature in February is 4 degrees F and that the distribution of minimum temperatures in February is approximately Normal. What p..
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What is the average monthly amount charge? What percent of monthly charges are between $600 and $ $889 What percent of monthly charges is less than $100.
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