Exam (elaborations)
STA 2023 Elementary Statistics Final_Review_STA2023_St_Petersburg_College.
- Institution
- Saint Petersburg College
STA 2023 Elementary Statistics
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: Quiz Submissions - Final Review (Bonus) - STA2023 Elementary Statistics Mode:(Online) Class#:2243 Instructor:Kennedy - St Petersburg College 4/30/20, 7:34 PMQuiz Submissions - Final Review (Bonus)
Kaitlyn Oquendo (username: koquen1)
A!empt 2
Wri!en: Apr 30, 2020 5:08 PM - Apr 30, 2020 7:31 PM
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Ques"on 1 point
State the null and alterna"ve hypotheses you would use to test the following
situa"on.
The average "me it takes for a person to experience pain relief from a certain pain
reliever is 15 minutes. A new ingredient is added to help speed up pain relief and an
experiment is conducted to test whether the new product does indeed speed up pain
relief.
What are the appropriate null and alterna"ve hypotheses for the experiment?
H0 : μ = 15
H1 : μ > 15
H0 : μ = 15
H1 : μ ≠ 15
H0 : μ = 15
H1 : μ < 15
Ques"on 2 point
Determine the specified confidence interval.
It has been estimated, with 90% confidence, the proportion of Americans who go out
shopping on Black Friday is 0.40 with a margin of error equal to 0.04.
Determine the resulting 90% confidence interval for the proportion of Americans who
go out shopping on Black Friday.
(0.40 , 0.44)
(0.36 , 0.40)
(0.36 , 0.44)
(0.38 , 0.42)
(0.86 , 0.94)
Ques"on 3 point
Select the most appropriate response.
What type of error is made if you fail to reject the null hypothesis when the null hypothesis is actually false?
Type II error
Type I error
cri"cal error
significant error
Ques"on 4 point
For the given significance test, explain the meaning of a Type I error.
https://mycourses.spcollege.edu/d2l/lms/quizzing/user/quiz_submissions_attempt.d2l?qi=797728&ai=10036821&isInPopup=0&isprv=0&dnb=0&cfql=0&d2l_body_type=1&ou=234782 Page 1 of 12
, : Quiz Submissions - Final Review (Bonus) - STA2023 Elementary Statistics Mode:(Online) Class#:2243 Instructor:Kennedy - St Petersburg College 4/30/20, 7:34 PM
A metropolitan city is trying to bring its smog level into federal guidelines and currently
has 12% pollutants per 10,000 volume of air. The city comes up with a new policy
where city employees are encouraged to use city transporta"on to and from work. An
independent agency, hired by the city, runs a test on the air in order to determine if
the new policy has had the desired effect.
The hypotheses are:
H0 : p = 0. 12
H1 : p < 0. 12
Explain the meaning of a Type I error.
Concluding that the smog-level has decreased when it actually has not.
Not concluding that the smog-level has increased when it actually has.
Concluding that the smog-level has increased when it actually has not.
Not concluding that the smog-level has decreased when it actually has.
Ques"on 5 point
State your conclusion to the hypothesis test.
Is achieving a basic skill level in a subject independent to the loca"on of the school? A
random sample of students categorized by the loca"on of school and the number
achieving basic skills in three subjects is shown in the table.
Subject
Loca"on of School Reading Math Science
Urban 43 42 38
Suburban 63 66 65
Conduct a chi-square test of independence at the 1% significance level to test whether
the two variables are independent and state your conclusion.
Hint: the test sta"s"c is: χ 2 = 0. 30
There is sufficient sample evidence to suggest that skill level in a subject is
dependent of loca"on.
There is sufficient sample evidence to suggest that skill level in a subject is
independent of loca"on.
There is not sufficient sample evidence to suggest that skill level in a subject is
dependent of loca"on.
There is not sufficient sample evidence to suggest that skill level in a subject is
independent of loca"on.
Cannot be determined.
Ques"on 6 point
Find the correla"on coefficient.
A group of persons filled in a ques"onnaire their age and the number of states they
visited. The results are recorded in the table below.
https://mycourses.spcollege.edu/d2l/lms/quizzing/user/quiz_submissions_attempt.d2l?qi=797728&ai=10036821&isInPopup=0&isprv=0&dnb=0&cfql=0&d2l_body_type=1&ou=234782 Page 2 of 12
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