In: Statistics and Probability
The Smucker's company believes it has the market share on Blackberry Jam with 65% of Blackberry Jam buyers buying Smucker's. But, a new company has come along and their Blackberry Jam is good! Smucker's gets a report back from Grocery Store Analytics which reported that of the 555 Blackberry Jam buyers last week, 329 bought Smucker's. At a significance level of 0.05, did the proportion of Blackberry Jam customers go down for Smucker's?