I need help with stats/2023, section 7.2 and 7.3, please help with TI-84 commands A car company says that the mean gas mileage for its luxury sedan is at least 22 miles per gallon​ (mpg). You believe...


I need help with stats/2023, section 7.2 and 7.3, please help with TI-84 commands



A car company says that the mean gas mileage for its luxury sedan is at least


22 miles per gallon​ (mpg). You believe the claim is incorrect and find that a random sample of 5

cars has a mean gas mileage of 21 mpg and a standard deviation of 5mpg. At α=0.10​,


test the​ company's claim. Assume the population is normally distributed.



Which sampling distribution should be used and​ why?



A.  Use a normal sampling distribution because the population is​ normal, and σ is known.




B. Use a normal sampling distribution because the population is​ normal, and


σ is unknown.






C.  Use a​ t-sampling distribution because the population is​ normal, and σ

is unknown.





D. Use a​ t-sampling distribution because n<>





E.  Use a​ t-sampling distribution because the population is​ normal, and



σ is known

F.  Use a normal sampling distribution because



n>30.


Write out the appropriate hypotheses to test and state the claim:

Ho:

Ha:



What is the value of the standardized test statistic?

The standardized test statistic is _______________. (round to 2 decimal places as needed.)


What is the critical value?

The critical value is _______________ (round to 3 decimal places as needed)


What is the outcome and the conclusion of the test?


(1) ___________ (reject or fail to reject) Ho. At the 10% significance level, there is (2) ___________ (sufficient or insufficient) eveidence to (3)__________________ ( reject or support) the car company's claim that the mean gas mileage for the luxury sedan is at least 22 miles per gallon.





Jun 06, 2022
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