Business Statistics End Term: Undated (undated)

An e-commerce company records the following information for a randomly selected hour:

•
: Number of orders received in the hour, where
.

•
: Number of orders returned during the hour, where
.

The joint probability distribution of
and
is given below.

Based on the above data, answer the given subquestions.

What are the values of the missing probabilities
,
, and
?

An e-commerce company records the following information for a randomly selected hour:

•
: Number of orders received in the hour, where
.

•
: Number of orders returned during the hour, where
.

The joint probability distribution of
and
is given below.

Based on the above data, answer the given subquestions.

Given that exactly one order is returned, find the probability that company received exactly two orders.

A retailer wants to determine whether the type of marketing campaign is associated with a

customer's purchase decision. A random sample of
customers is classified as follows:

The retailer wants to test whether marketing campaign and purchase decision are independent at

the
significance level.

Use the chi-square critical values at the
significance level for selected degrees of freedom as:

Based on the above data, answer the given subquestions.

What is the value of
test statistic?