The following table shows the U.S. market share for smartphone manufacturers in 2013 according to the research firm comScore.

The table also shows the frequency of purchases of smartphones by brand for a random sample of customers during 2014.

Brand Market Share 2013

(%)

Observed Frequency 2014 Apple 36.3 20 Samsung 21.0 14 HTC 10.2 4 Motorola 9.1 3 Other 23.4 9 Total 100 50

a. Using a = 0.05, perform a chi-square test to determine if the observed frequencies in the table are consistent with the comScore report.

b. Determine the p-value for the chi-square test statistic using Excel and interpret its meaning.AppendixLO1