Does advertising influence children as young as three years old?
Researchers at Stanford University conducted a taste test with preschoolers. Each preschooler
tasted two identical samples of five food items (hamburger, french fries, chicken nuggets, baby
carrots, and milk). For each item, the children tasted one sample wrapped in a McDonald's wrapper
and the other sample in an identical, but unbranded, wrapper. Some children tasted the sample in
the branded wrapper first, while others tasted the sample in the unbranded wrapper first.
Consistently for all food items, the majority of preschoolers preferred the food in the McDonald's
wrapper over the one in the unbranded wrapper, even though both samples were identical.
[Source: T. N. Robinson, et al. 2007. "Effects of Fast Food Branding on Young Children's Taste
Preferences." Archives of Pediatrics and Adolescent Medicine 161: 792-97.]
The researchers found that the preschoolers who watched more television or ate more often at
McDonald's were more likely to prefer the food wrapped in a McDonald's wrapper. However, is it
possible that the children were attracted to the branded wrapper because it had more writing and
colors on it, rather than because they recognized the McDonald's logo? They were also curious
about whether children would behave differently with the McDonald's signature foods, such as
hamburgers, french fries, and chicken nuggets, than they would with foods with less name brand
significance, such as apple slices.
You decide to conduct a similar experiment with 64 toddlers. The results are as follows:
Chi square analysis does have limitations. What is the potential violation of these limitations with
this particular chi square distribution?
There is no problem with this chi square distribution.
A chi square analysis can only be performed on a 2 imes 2 table.
There is at least one cell with expected frequency ( f_(e) ) of 5 or fewer.
There is at least one cell with an observed frequency (f_(0)) of 5 or fewer.
Would the Yates correction for continuity help? If so, why? If not, why not?
Yes, the Yates correction for continuity is the safest course to take corrective action
whenever any of the cells have frequencies of 5 or fewer.
No, there is no need for the Yates correction for continuity, because there is no problem
with this chi square distribution.
No, the Yates correction for continuity works only for 2 imes 2 tables.
You want to figure out what it is about the wrapper that the children are recognizing, so you are
thinking of adding the chocolate shake-which is highly recognizable-and using several forms of
packaging: completely plain packaging, completely branded packaging, packaging with the
McDonald's colors, packaging with the McDonald's logo but not the McDonald's colors, and
packaging from another fast food chain that does not advertise on television.
What could be a problem with the chi square analysis for this design?
There is no difficulty with a chi square analysis for this design.
Chi square tests become difficult to interpret when the variables have many categories.
The categories are not distinct enough.
There is no difficulty because the children will be getting an opportunity to drink
chocolate shakes.
Does advertising influence children as young as three years old?
Researchers at Stanford University conducted a taste test with preschoolers. Each preschooler tasted two identical samples of five food items (hamburger, french fries, chicken nuggets, baby carrots, and milk). For each item, the children tasted one sample wrapped in a McDonald's wrapper and the other sample in an identical, but unbranded, wrapper. Some children tasted the sample in the branded wrapper first, while others tasted the sample in the unbranded wrapper first. Consistently for all food items, the majority of preschoolers preferred the food in the McDonald's wrapper over the one in the unbranded wrapper, even though both samples were identical. [Source:T. N. Robinson, et al.2007.Effects of Fast Food Branding on Young Children's Taste Preferences. Archives of Pediatrics and Adolescent Medicine 161: 792-97.]
The researchers found that the preschoolers who watched more television or ate more often at McDonald's were more likely to prefer the food wrapped in a McDonald's wrapper. However, is it possible that the children were attracted to the branded wrapper because it had more writing and colors on it, rather than because they recognized the McDonald's logo? They were also curious about whether children would behave differently with the McDonald's signature foods, such as hamburgers, french fries, and chicken nuggets, than they would with foods with less name brand significance, such as apple slices.
You decide to conduct a similar experiment with 64 toddlers.The results are as follows
Observed Frequencies for Package Preference by Food Type Food French Chicken Apple Packaging Hamburger Fries Nuggets Slices McDonald's 13 11 14 7 wrapper Unbranded 5 4 4 wrapper Totals 18 17 18 11
Totals 45
19
64
Chi square analysis does have limitations. What is the potential violation of these limitations with this particular chi square distribution?
There is no problem with this chi square distribution.
A chi square analysis can only be performed on a 2 2 table. There is at least one cell with expected frequency (fe) of 5 or fewer. There is at least one cell with an observed frequency (fo) of 5 or fewer.
Would the Yates correction for continuity help? If so, why? If not, why not?
Yes, the Yates correction for continuity is the safest course to take corrective action whenever any of the cells have frequencies of 5 or fewer.
No, there is no need for the Yates correction for continuity, because there is no problem with this chi square distribution.
No, the Yates correction for continuity works only for 2 x 2 tables.
You want to figure out what it is about the wrapper that the children are recognizing, so you are thinking of adding the chocolate shakewhich is highly recognizableand using several forms of packaging: completely plain packaging, completely branded packaging, packaging with the McDonald's colors, packaging with the McDonald's logo but not the McDonald's colors, and
What could be a problem with the chi square analysis for this design?
There is no difficulty with a chi square analysis for this design. Chi square tests become difficult to interpret when the variables have many categories. The categories are not distinct enough. There is no difficulty because the children will be getting an opportunity to drink chocolate shakes.