Question

A study by a reputable research group captured multitasking activities of adults who use different devices while watching TV. The study reported that 322 of 449 (72​%) smartphone users​ sampled, 197 of 345 (57​%) computer users​ sampled, and 146 of 266 (55​%) tablet users sampled used their device to check social media unrelated to the video content while watching TV. Complete parts​ (a) through​ (c) below.

The test statistic is x2STAT=

The critical value for a 0.10=

The p-value is=

Answer 1

Applying chi square test of independence:

Expected	Ei=row total*column total/grand total	smartphone	computer	tablet	Total
	Use	281.68	216.44	166.88	665
	not use	167.32	128.56	99.12	395
	total	449	345	266	1060
chi square    χ2	=(Oi-Ei)2/Ei	smartphone	computer	tablet	Total
	Use	5.7702	1.7458	2.6119	10.1279
	not use	9.7144	2.9392	4.3972	17.0508
	total	15.4847	4.6850	7.0091	27.1788

test statistic X2 =

27.1788

for 2 df and 0.1 level of signifcance critical region       χ2=

4.6052

p value =

0.0000