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Formatieve toetsen Statistiek 1
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Dit zijn de formatieve toetsen van Statistiek 1. Hier kwamen een aantal vragen exact van op het tentamen. Verder ook fijn om mee te oefenen. De antwoorden staat dikgedrukt
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Statistiek 1: Formatieve Toets 1Vraag 1:
A prospective graduate student may be interested in gender balance at the university s/he will
attend. Data on how many males and females attend the institution are examples of
a) Descriptive statistics
b) Inferential statistics
Vraag 2:
Uncertainty regarding conclusions about a population can be eliminated if you ________
a) Use a large random sample
b) Obtain data from all members of the population
c) Depend upon the t-distribution
d) Both a and b
Vraag 3:
A Biased sample is one that ______
a) Is too small
b) Will always lead to a wrong conclusion
c) Will likely have certain groups from the population over-represented or under-
represented due only to chance factors
d) Will likely have certain groups from the population over-represented or under-
represented due only to systematic sampling factors
Vraag 4:
The following distribution has:
a) A positive skew (skew = scheef)
b) A left skew
c) No skew
Vraag 5:
What is the best measure of central tendency for the following set of numbers?
98,78,56,23,587
a) Mean
b) Mode
c) Median
d) Standard Deviation
, Vraag 6:
Rachael and Peter are discussing how the mean value and variance affect the distribution
graph. As the following graph shows, there are two distributions: A and B
Peter said that the distribution A has fatter tail because its has bigger standard deviation than
the distribution B. Rachael's answer is different:she thinks the distribution A has a smaller
standard deviation than the distribution B.
Who do you think is right?
a) Peter
b) Rachael
c) None of them are right. Distribution A and Distribution B have the same standard
Deviation
Vraag 7:
Identify the scale of measurement for the following military hierarchy: Lieutenant, Captain,
Major
a) Interval
b) Nominal
c) Ratio
d) Ordinal
Vraag 8:
Low-density lipoprotein (LDL) is an important part of blood cholesterol test. LDL higher than
130mg/dl is a risk factor of developing cardiovascular disease. To prevent cardiovascular
disease, a health center had a free blood cholesterol test for all the people older than 65 in the
community. A total of eight people attended the blood screening and their blood test results
are listed below:
LDL(mg/dl): 130,143,114,110,123,110,134,124
After the blood test, the nurse wants to know the median LDL score: 123.5
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