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Data consistent with summary quantities in the article "Effects of Fast-Food Consumption on Energy Intake and...

Data consistent with summary quantities in the article "Effects of Fast-Food Consumption on Energy Intake and Diet Quality Among Children" on total calorie consumption on a particular day are given for a sample of children who did not eat fast food on that day and for a sample of children who did eat fast food on that day. Assume that it is reasonable to regard these samples as representative of the population of children in the United States.

No Fast Food
2338 1925 1016 1737 1476 2060 2150 1988
1859 1784 1772 1834 1655 1513 2676
Fast Food
2539 1774   950 2344 2450 2283 2542 1211
  906 1527   891 2223 1827 1266 2133

(a) Use the given information to estimate the mean calorie intake for children in the United States on a day when no fast food is consumed. (Give the answer to one decimal place.)


(b) Use the given information to estimate the mean calorie intake for children in the United States on a day when fast food is consumed. (Give the answer to one decimal place.)


(c) Use the given information to estimate the produce estimates of the standard deviations of calorie intake for days when no fast food is consumed and for days when fast food is consumed. (Give the answer to three decimal places.)
No Fast Food is consumed
s =

Fast Food is consumed
s =

math   Statistics-And-Probability   
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Answer #1

a) from excel function: average(array)

mean calorie intake for children in the United States on a day when no fast food is consumed

=1852.2

b)

mean calorie intake for children in the United States on a day when fast food is consumed =1791.1

c)

from excel function: stdev(array)

No Fast Food is consumed
s = 386.346

Fast food is consumed s =620.660

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