When studying the effect of temperature on the sale of ice cream, a researcher records the number of ice cream cones sold on cold days versus those sold on hot days. in this case, the researcher would most likely compare to describe the results.

group mean

Explanation:

Group mean is the mean of grouped data. Grouped data are data formed by the summation of individual observations of a variable into groups, so that a frequency distribution of these groups makes it easy to summarize or analyze data.

The group data of the sales of ice cream on hot days is different for those on cold days. assuming you took a range of data for each for three months. you would be able to compare results after collecting the mean of each group of data collected

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.