An analyst at a local bank wonders if the age distribution of customers coming for service at his branch in town is the same as at the branch located near the mall. He selects 100 transactions at random from each branch and researches the age information for the associated customer. Here are the data:

a) What is the null hypothesis?

b) What type of test is this?

c) What are the expected numbers for each cell if the null hypothesis is true?

d) Find the statistic.

e) How many degrees of freedom does it have?

f) Find the critical value at g) What do you conclude?

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In-town branch Mall branch Total Age Less than 30 30-55 56 or older Total 20 40 40 100 30 50 20 100 100 100 200 200 228