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data analysis exam 1 questions with verified solutions
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data analysis exam 1 questions with verified solutions
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data analysis exam 1How do descriptive and inferential statistics differ?
a. Inferential statistics attempts to describe data, while descriptive statistics attempts to make
predictions based on data.
b. Descriptive statistics attempts to describe data, while inferential statistics attempts to make
predictions based on data.
c. Descriptive statistics are more computationally sophisticated than inferential statistics.
d. None of these are correct. - correct answer ✔✔b. Descriptive statistics attempts to describe data,
while inferential statistics attempts to make predictions based on data.
A prediction has been made that the chance that a person will be robbed in a certain city is 15%. This is
an example of...
a. Inferential statistics.
b. Descriptive statistics.
c. Either inferential statistics or descriptive statistics.
Neither inferential statistics nor descriptive statistics. - correct answer ✔✔a. Inferential statistics.
Mary wanted to find out how the amount of sunlight affects the growth of plants. She placed two
tomato plants in 10-inch pots with potting soil and watered them ¼ cup each day. One plant was placed
under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each
week for three weeks. What are the control variables? (Select 2 answers)
a. Using the same type of plant
b. Each plant was placed in a 10-inch pot
c. The growth of the plant
d. One plant is in the sunlight and the other is under a box - correct answer ✔✔a. Using the same type
of plant
,b. Each plant was placed in a 10-inch pot
Which of the following is an example of time series data?
a. The sales price of townhouses sold last year
b. Quarterly housing starts collected over the last 60 years
c. Results of market research testing consumer preferences for soda
d. Starting salaries of recent business graduates at Penn State University - correct answer ✔✔b.
Quarterly housing starts collected over the last 60 years
1. A recent survey of 2,000 adults having an MBA reported that the average salary of these 2,000 adults
is more than $65,000 a year. This is an example of:
a. Inferential statistics.
b. Descriptive statistics.
c. Either inferential statistics or descriptive statistics.
d. Neither inferential statistics nor descriptive statistics. - correct answer ✔✔b. Descriptive statistics.
The two main branches of statistics are________________ and ___________.
a. mathematical and computational
b. computational and inferential
c. mathematical and descriptive
d. descriptive and inferential - correct answer ✔✔d. descriptive and inferential
Joe makes five paper helicopters with different wing lengths. He drops them the same way from a height
of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the
ground. What is the independent variable?
a. Dropping the same way
b. Wing Length
, c. Amount of time it takes the helicopter to hit the floor
d. Dropping from the same height - correct answer ✔✔b. Wing Length
What type of statistics consists of generalizing from samples to populations, performing estimations and
hypothesis tests, determining relationships among variables, and making predictions?
a. Inferential statistics.
b. Descriptive statistics.
c. Either inferential statistics or descriptive statistics.
d. Neither inferential statistics nor descriptive statistics. - correct answer ✔✔a. Inferential statistics.
What type of statistics consists of the collection, organization, summarization and presentation of data?
a. Inferential statistics.
b. Descriptive statistics.
c. Either inferential statistics or descriptive statistics.
d. Neither inferential statistics nor descriptive statistics. - correct answer ✔✔b. Descriptive statistics.
Mary wanted to find out how the amount of sunlight affects the growth of plants. She placed two
tomato plants in 10-inch pots with potting soil and watered them ¼ cup each day. One plant was placed
under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each
week for three weeks. What is the independent variable?
a. Using the same type of plant
b. Each plant was placed in a 10-inch pot
c. The growth of the plant
d. One plant is in the sunlight and the other is under a box - correct answer ✔✔d. One plant is in the
sunlight and the other is under a box
The variable that is changed on purpose is the ...
a. Lurking or confounding variable
b. Constant variable
c. Independent Variable
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