Data table below shows the number of 100 computers sold for a specific brand. Researchers want to determine if there is a preference, the null hypothesis is that there is none. Model Pear Delo ITM Pbr...

Data table below shows the number of 100 computers sold for a specific brand. Researchers want to determine if there is a preference, the null hypothesis is that there is none.

Model Pear Delo ITM Pbr

#Sold   30    30      20     20

Calculate the expected frequencies:

Calculate the test statistic (Chi-Squared):

Using the critical value and the area of the upper tail (df=3), should we reject the null hypothesis if the α = 0.05?