ECO 391, Exam 1 ICR questions and answers graded A+ 2025/2026

ECO 391, Exam 1 ICR questions and
answers graded A+ 2025/2026
A subset of a population selected to represent the population is called a... - correct answer
✔✔Sample



Which of the following does *not* represent a continuous random variable? - correct answer
✔✔Number of students in the classroom



As a general guideline, the research hypothesis should be stated as... - correct answer
✔✔Alternative hypothesis



Which of the following is *not* a valid null hypothesis? - correct answer ✔✔Ho: μ < 0



Which setup refers to a negative one-tail test? - correct answer ✔✔Ho: μ ≥ 41, Ha: μ < 41



Avg yearly return of stock is 10%. Test this claim. What is the hypothesis? - correct answer
✔✔Ho: μ ≥ 10, Ha: μ < 10



A company emits 10 tons of methane per year. Test whether it is emitting *more* than 10 tons.
- correct answer ✔✔Ho: μ ≤ 10, Ha: μ > 10



Avg temperature is 80°F over 32 years. What is the correct hypothesis? - correct answer ✔✔Ho:
μ = 80, Ha: μ ≠ 80



If the null hypothesis is rejected at the 1% significance level... - correct answer ✔✔It will also be
rejected at the 5% significance level.