At a certain college a random sample of 90 college students were surveyed and 75 students...
At a certain college a random sample of 90 college students were surveyed and 75 students were found to have cars on campus. It had long been believed that 80% of students kept their cars on campus. Is there evidence, using alpha = 0.05, to say the proportion has increased?
- State the type of test you are performing (multiple choice)
- State the null and alternative hypotheses
- Using Minitab results, state the test statistic
- Using Minitab results, state the p-value
- Decision
- Conclusion
Homework Answers
Ans:
z test for one proportion.
sample proportion=75/90=0.8333
Test statistic:
z=0.790
p-value=2*P(z>0.79)=0.4295
As,p-value>0.05,we fail to reject the null hypothesis.
There is not sufficient evidence to conclude that proportion of student kept their cars on campus is different from 0.8.
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