Question
Chance for Promotion In October $1998,30 \%$ of employed adults were satisfied with their chances for promotion. A human resource manager wants to determine if this percentage has changed significantly since then. She randomly selects 280 employed adults and finds that 112 of them are completely satisfied with their chances for promotion. Is the percentage of employed adults satisfied with their chances for promotion changed significantly from the percentage in $1998,$ at the $\alpha=0.1$ level of significance?
Step 1
The null hypothesis is that the proportion of employed adults satisfied with their chances for promotion has not changed since 1998, i.e., $P = 0.3$. The alternative hypothesis is that the proportion has changed, i.e., $P \neq 0.3$. Show more…
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