Is the statement that the true fuel efficiency of the

3. Is the statement that the true fuel efficiency of the 2019 Ferrari 488 Spider is between 12 and 19 mpg
an example of descriptive or inferential statistics? Why?
(A) Inferential statistics because it summarizes the collected data.
(B) Descriptive statistics because it summarizes the collected data.
(C) Inferential statistics because it is making a prediction about a population.
(D) Descriptive statistics because it is making a prediction about a population.

STAT 2300 Test #1 (Version A) Spring 2019
4. Researchers studying a pack of gray wolves in North America collected data on the length 𝑥𝑥 , in
meters, and the weight 𝑦𝑦 , in kilograms, of the wolves. A scatterplot of weight versus length indicated
a relationship between the two variables described as positive, linear and strong. Which of the
following statements is a correct interpretation of the word "strong" in the description of the
association?
Page 3 of 13
Use the following information to answer questions 5 – 6.
Suppose that, near the end of the semester, the instructors of STAT 2300 decide to take a sample of
students in the course and conduct interviews about satisfaction with the course. Several different
sampling plans are proposed. Identify the type of sample described in each scenario below.
5. Since the instructor may affect student satisfaction, a simple random sample is selected from each
instructor's students. This would be a…
6. Students who are worried about their grade are allowed to participate in the interview for extra
credit. This would be a…

STAT 2300 Test #1 (Version A) Spring 2019
7. Dr. Brown wears a fitbit to keep track of the number of steps that she takes each day, with a goal of
12,000 steps per day. The distribution of her number of steps per day for the 365 days in 2018 is
roughly bell-shaped with a mean of 12,250 steps and a standard deviation of 3,000 steps. According
to the Empirical Rule, approximately what percentage of the days in 2018 did Dr. Brown take more
than 18,250 steps?
(A) 0.3%
(B) 2.5%
(C) 16%
(D) The Empirical Rule does not apply to this distribution.
Page 4 of 13