Question

Use the smartphone data. Test if the phone type ("Phone Type") and beliefs about the impact...

Use the smartphone data. Test if the phone type ("Phone Type") and beliefs about the impact of social media ("Impact of SocNetworking" ) are related or not. Use R to find the test statistic.

**Answer is 8.82**

Phone Type Impact of SocNetworking
iPhone worse
Android smartphone better
Android smartphone better
iPhone better
iPhone worse
iPhone no impact
Android smartphone better
iPhone no impact
iPhone no impact
iPhone better
Android smartphone no impact
Android smartphone better
iPhone better
Android smartphone worse
Android smartphone no impact
Android smartphone better
Android smartphone better
iPhone better
Android smartphone no impact
iPhone better
Android smartphone worse
Android smartphone worse
iPhone better
Android smartphone no impact
iPhone no impact
iPhone better
Android smartphone no impact
iPhone better
iPhone better
iPhone no impact
Android smartphone better
Android smartphone worse
iPhone better
Android smartphone worse
iPhone better
Android smartphone better
Android smartphone better
Android smartphone better
Android smartphone no impact
Android smartphone worse
Android smartphone worse
Android smartphone better
iPhone better
iPhone better
iPhone better
iPhone worse
Android smartphone better
Android smartphone no impact
iPhone better
iPhone better
iPhone worse
iPhone better
iPhone better
iPhone better
iPhone better
Android smartphone worse
iPhone no impact
iPhone better
Android smartphone no impact
iPhone better
iPhone better
Android smartphone worse
iPhone better
iPhone better
Android smartphone worse
iPhone better
iPhone no impact
Android smartphone no impact
iPhone better
Android smartphone better
iPhone better
iPhone no impact
iPhone no impact
Android smartphone worse
iPhone better
iPhone better

**Answer is 8.82**

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Use the following code to do the chi-square test in R

getwd() #to figure out your file directory and place the data file in csv format

phone <- read.csv("phone.csv") #reading the data into r from the default directory

head(phone) # Top 5 data rows of data just to check if you have imported correctly

better no impact worse
Android smartphone 13 9 11
iPhone 30 9 4

table(phone$Phone.Type, phone$Impact.of.SocNetworking)

chisq.test(phone$Phone.Type, phone$Impact.of.SocNetworking)

Output :

Pearson's Chi-squared test
X-squared = 8.8246, df = 2, p-value = 0.01213

The chi-squared that we get is 8.8246.

We get a p-Value less than the significance level of 0.05, we will have to reject the null hypothesis.

Hence, Phone type and Impact of Social Networking are independent

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