An organization claims that the thought of adults ages 55 and over on which industry has the most trustworthy advertising is uniformly distributed. To test this claim, you randomly select 800 adults ages 55 and over and ask each which industry has the most trustworthy advertising. The table shows the results. At α = 0.05, test the organization’s claim.
Response Frequency, f
Auto companies ……………….. 128
Fast food companies …………... 192
Financial services companies ….. 112
Pharmaceutical companies …….. 152
Soft drink companies …………... 216
(a) Identify the expected distribution and state H0 and Ha,
(b) Find the critical value and identify the rejection region,
(c) Find the chi-square test statistic,
(d) Decide whether to reject or fail to reject the null hypothesis,
(e) Interpret the decision in the context of the original claim. |
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