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AssignmentsWEEK1 - Seminar 1.1
Don’t forget watching the videos!
Statistical concepts to be discussed: level of measurement, measures of central tendency,
measures of variability, normal distribution, skewness, bar chart, histogram, frequency table,
box plot
Question 1
What is the level of measurement for the number of pets in a family?
a. Nominal
b. Ordinal
c. Interval
d. Ratio
Ratio heft een absoluut nulpunt, en het verschil tussen de getallen heeft een betekenis. Je
kan ze vergelijken. De waarden zijn continu.
Bij nominaal zit er geen ordening/volgorde in de getallen; ze hebben geen betekenis en zijn
enkel een label. Bij ordinaal is er een gelijke afstand tussen de getallen, hier niet. Dat kan
hier niet. Betekent 0 een afwezigheid van de variabele? Ja, dus is het een ratio.
Question 2
In which situation is the median a better summary statistic than the mean?
a. When the data are of nominal scale level
b. When the data are of ordinal scale level
c. When the data are of interval scale level
d. When the data are of ratio scale level
De median verdeelt de populatie in 2 gelijke stukken; het is het middelste nummer. Bij een
ordinale schaal is er sprake van ranking waardoor er gemakkelijk een punt kan worden
aangewezen die de populatie in 2 splitst (ze hebben wél een specifieke volgorde). Bij
nominale verdeling is er geen specifieke volgorde dus kan je geen mediaan berekenen. Ook
bij de interval schaal is het moeilijker dan ordinaal om een middelste getal te nemen.
Question 3
What type of graph is appropriate when summarizing blood types in patients with prostate
cancer?
a. Bar chart
, b. Box plot
c. Histogram
d. Scatter plot
Het is ratio, want 0 betekent een afwezigheid van de variabele. Bij ratio hoort een boxplot of
een histogram. Het histogram weergeeft het best de verschillen tussen de bloedgroepen.
Question 4
Which of the following is NOT true for a normal distribution?
a. Median is equal to the mode
b. Mode is equal to the mean
c. The distribution is skewed to the right
d. Approximately 95% of the observations are located between the mean minus two
times the standard deviation and the means plus two times the standard deviation
Question 5
Which of the following is true for a distribution skewed to the left?
a. The mean is smaller than the median, the median is smaller than the mode
b. The mode is smaller than the median, the median is smaller than the mean
c. The median is smaller than the mean, the mean is smaller than the mode
d. The mode, median and mean are equal
Bij een linksscheve verdelingskromme ligt
het gemiddelde links van de mediaan. De
mediaan ligt links van de modus. De mean
is kleiner dan de mediaan, en de mediaan is
kleiner dan de modus.
Question 6
Which of the following is true of a normal distribution?
a. The distribution has two modes
b. The distribution is not symmetric
c. Approximately 68% of the observations are located between the mean minus one
standard deviation and the mean plus one standard deviation
d. Approximately 50% of the observations are located between the mean minus one
standard deviation and the mean plus one standard deviation
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