[1] In each case, state whether the situation illustrates inferential or descriptive statistics
a) In a random sample of 200 U.S. adult women (20 to 40 years old), 168 had heights between 63 and
64 inches. So, 84% of t
...
[1] In each case, state whether the situation illustrates inferential or descriptive statistics
a) In a random sample of 200 U.S. adult women (20 to 40 years old), 168 had heights between 63 and
64 inches. So, 84% of these women had heights between 63 and 64 inches
- descriptive statistics
b) Eighteen percent of U.S. self-prepared tax returns have errors. This was concluded after a sample of
950 U.S. self-prepared tax returns showed that 171 had errors
- inferential statistics
[2] In each case, state whether the situation illustrates the use of a parameter or a statistic.
a) According to the Department of Transportation, 60% of all vehicle passengers wear seat belts
- parameter
b) In a sample of 49 women who served in the U.S. House of Representatives, 74% are Democrats
- statistic
[3] In each case, state whether the situation involves an experiment or an observational study.
a) A financial researcher is interested in whether companies that give large bonuses to their CEO’s (at
least $1 per year) have a higher stock price
- observational study
b) To test the effectiveness of a new treatment against chronic tendinosis, a group of medical
researchers administers the treatment to a sample of 50 patients with chronic tendinosis. Data on
tendon thickness (in millimeters) were collected by ultrasonography before and after the treatment of
each patient in order to compare the mean tendon thickness before the treatment with the mean tendon
thickness after the treatment
- experiment
[4] An investigator is interested in the gender, ethnicity, GPA, number of credits completed, year- incollege classification, and career path of students at FIU. She collected information from 4 FIU students
and is presented in the given table. Use this information to answer the questions
Studen
t Gender Ethnicity GPA Credits Classification Career Path
Amal Female Arab 3.91 30 Sophomore Biology
Brian Male African American 3.89 69 Junior Engineering
Nancy Female American 3.75 14 Freshman Psychology
Maria Female Latina 3.90 45 Sophomore Nursing
a) Describe the relevant population
- population(all students at FIU)
b) What was the observation obtained from Amal?
- She is female, is Arab, has a 3.91 GPA, has completed 30 credits, is a sophomore, and is following a
biology career path.
c) Did the investigator conduct a census? Explain
- no because she only collected information from 4 FIU students, not ALL.
d) List the elements of the study
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