Lesson 21: Homework Quiz
Question 1
1 / 1 pts
If the correlation coefficient (r) is positive, when one variable decreases,
the other variable:
stays the same.
Question 2
1 / 1 pts
Data was collected on homes fo
...
Lesson 21: Homework Quiz
Question 1
1 / 1 pts
If the correlation coefficient (r) is positive, when one variable decreases,
the other variable:
stays the same.
Question 2
1 / 1 pts
Data was collected on homes for sale in Madison County as of January
2011. Information on the listings such as price, size of the home, and style
were recorded. The data are recorded
in MadisonCountyRealEstate.xlsx (Links to an external site.)Links to an
external site..
Create a scatterplot of the price of homes (ListPrice) compared with how
old the homes are (Age). Select the answer that best describes the data
illustrated in the scatterplot.
Question 3
1 / 1 pts
Use the following information to answer the next 2 questions.
Researchers studying healthy body composition recorded various
measurements of 252 male subjects. Height, weight, age, and other
measurements were collected on each subject. The data are recorded
in BodyMeasurementsCorrected.xlsx (Links to an external site.)Links to an
external site. For this exercise, we will look at the height of the subjects
compared with the weight.
Compute the sample correlation coefficient of the height compared with
the weight. Give your answer accurate to three decimal places. (Example:
Question 4
1 / 1 pts
Create a scatterplot using these two variables. Using this scatterplot and
referring to the correlation coefficient above, select the answer that best
describes the data illustrated in the scatterplot.
Question 5
1 / 1 pts
The entrance rate into a prestigious university's graduate program is 13%.
A statistics student wants to know if the entrance rate of applicants from
BYU-Idaho is greater than the typical entrance rate. He decides to conduct
a hypothesis test of one proportion to determine whether the entrance
rate of BYU-Idaho students into the graduate program is higher than 13%.
He randomly selects 60 students who have applied and records whether
or not each student was admitted. Were the requirements for the
hypothesis test met? Explain.
Question 6
1 / 1 pts
A factory makes components used in jet engines, including reinforced
steel washers. The washers are required to have a very precise thickness.
The thickness of the washers follow a normal distribution with mean 1.59
millimeters and standard deviation 0.042 millimeters. A technician
randomly samples n=20 washers and calculates the mean of their
thicknesses, which is x¯. What is the probability that x¯<1.57?
Question 7
1 / 1 pts
Use the following information to answer the next 3 questions.
Parents of children with developmental disorders can apply for federal
funding, to help pay for psychosocial rehabilitation. A sociologist working
for the annual Current Population Survey wants to know the percentage of
applicants for this funding who are in poverty. She needs a sample of
applicants from across the U.S., so she groups all of the applications by
state and randomly selects applicants from each state.
What sampling scheme did she use?
Stratified sampling
Question 8
1 / 1 pts
She calculates the percentage of applicants in her sample that are in
poverty. Is this percentage a parameter or a statistic, and why?
Question 9
1 / 1 pts
What was the population being studied?
Quiz Score: 9 out of 9
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