Exam (elaborations)
STA1502 Assignment 03
- Institution
- University Of South Africa (Unisa)
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Sta1502Assignment 03
Year module
2022
, Question 1
The JSE listed the market share in 2020 of the 5 firms that manufactured a particular product. A
marketing analyst wants to determine whether the market shares have changed since 2020. The
following table shows the number of customers who recently purchased the product at each firm.
Answer
The rejection region at 5% level of significance is chi squared X2 > 11.1.
Question 2
Consider a multinomial experiment with N = 250 and k = 5. The null hypothesis to be tested is
H0 : p1 = 0.45; p2 = 0.20; p3 = 0.25; p4 = 0.15.
The observed frequencies resulting from the experiment are
Answer
86.0196
Question 3
Suppose that an analyst wants to conduct a test of independence at 1% level of significance between
the variable A and the variable B as given below.
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