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Stat 200 Final Exam questions with correct answers.
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Stat 200 Final Exam questions with correct answers.
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Stat 200 Final Exam questions withcorrect answers
On a recent survey, Stat 200 students were asked: How low must the temperature go (in degrees
Fahrenheit) for you to stop wearing shorts when you are out and about, such as going to class. It was
also determined whether the student was a female or male. The goal is to compare the responses for
the two genders.
In this instance, which is true about the two variables? - CORRECT ANSWER-✔✔✅the explanatory
variable is categorical and the response variable is quantitative
Which is untrue about the standard deviation? The standard deviation is _____
A) is an accurate measure of spread no matter what is the shape of the data.
B) only be fully interpreted when the empirical rule is applied
C) a sensitive measure of spread
D) roughly defined as the average distance of an observed value from the mean - CORRECT ANSWER-
✔✔✅A) is an accurate measure of spread no matter what the shape of the data is
A recent Gallup Poll found that 60% of all American adults enjoy saving money more than spending it.
The results are based on telephone (both cell and landline) interviews with a random sample of 2,017
national adults, aged 18 and older.
Ideally: What is the population of interest to the Gallup Poll?
A) all American adults
B) all American adults who have telephones (cell and/or landlines)
C) all American adults who support "saving" over "spending"
D) 2,017 American adults who participated in the Gallup Poll - CORRECT ANSWER-✔✔✅A) all American
adults
,A recent Gallup Poll found that 60% of all American adults enjoy saving money more than spending it.
The results are based on telephone (both cell and landline) interviews with a random sample of 2,017
national adults, aged 18 and older. The data that is initially obtained from each adult is:
A) categorical
B) quantitative and discrete
C) quantitative and continuous - CORRECT ANSWER-✔✔✅A) categorical
The typical number of hours/night spent sleeping when considering college students has a normal shape
where the mean is 7 hours and the standard deviation is 1.2 hours.
About 99.7% of the hours/night spend sleeping fall within what boundaries? Identify the correct
calculation.
A) 7 ± 1
B) 7 ± 2
C) 7 ± 3
D) 7 ± 2×(1.2)
E) 7 ± 3×(1.2) - CORRECT ANSWER-✔✔✅E) 7 ± 3 x (1.2)
The distance (in miles) between where you live in State College and your home town/city
This random variable is ________:
A) discrete
B) continuous - CORRECT ANSWER-✔✔✅B) continuous
This table summarizes resting heart rates (beats/minute) for 20 PSU female athletes :
Min Q1 Median Q3 Max
40 45 50 60 70
In this instance: which is the correct interpretation of the IQR? The variation in the _________
, A) middle 50% of the data spans 15 beats/min
B) middle 50% of the data spans 5 beats/min
C) outer 50% of the data spans 15 beats/min
D) outer 50% of the data spans 5 beats/min - CORRECT ANSWER-✔✔✅A) the middle 50% of the data
spans 15 beats/minute
To test the stimulus effect of caffeine, a study took a sample of 14 students and randomly divided them
into two equal groups such that each were given one of two possible doses of caffeine (100 mg, 200
mg). Two hours later, each student was asked to complete a tapping exercise. The response variable is:
the number of taps/minute. The goal is to determine if the mean number of taps/minute is larger for
those taking 200 mg.
This study is:
A) a randomized experiment where a cause and effect statement could be included
B) a randomized experiment where a cause and effect statement could not be included
C) an observational study where cause and effect statement could be included
D) an observational study where cause and effect statement could not be included - CORRECT ANSWER-
✔✔✅A) a randomized experiment where a cause and effect statement could not be concluded
This table summarizes amount of time (in hours/day) spent on the computer by 20 Stat 200 students
Min Q1 Median Q3 Max
1 3 4 6 10
Approximately what percent of the computer times lie above 6 hours/day?
A) 0%
B) 25%
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