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6. mode>median>mean means that the distribution is
- normal
- negatively skewed
- symmetrical
- positively skewed
7. If Q2-Q1<Q3-Q2 then the distribution is
- positively skewed
- negatively skewed
- symmetrical
- uniform
8. For a histogram data needs to be
- coded
- continuous
- discrete
- qualitative
9. A tree diagram shows
- skewness
- distribution of data
- probability of events
- a normal distribution
10. Mutually Exclusive events have
- no outcomes in common
- one repeated outcome
- three outcomes happening at the same time
- several outcomes in common
11. Events are independent if they have
- no effect on each other
- no outcomes in common
- a positive effect on each other
- a negative effect on each other
12. The Product Moment Correlation Coefficient is not affected by coding
13. r=-1 implies
- weak negative correlation
- no correlation
- perfect negative correlation
- perfect positive correlation
14. The equation of the line of regression is
- y=a+bx
- y=a-bx
- x=bx+a
- y=mx+c
- y=b+ax
15. Extrapolation is unreliable because
- the value is inside the range of the data
- the value is outside the range of the data
- the data set is too small
- the values are rounded
16. A Sample Space is
- a list of all possible outcomes
- an event
- a set of discrete data
17. A Random Variable may be
- discrete or continous
- discrete
- continuous
- neither discrete or continuous
18. E(aX+b) =
- a E(X)
- E(a)+E(X)+E(b)
- aE(X)+b
- a squared E(X)
- b squared E(X) +a
19. When all the probabilities are the same the discrete random variable is
- outfit
- binomial
- uniform
- normal
20. The normal distribution Z has
- any mean and standard distribution
- mean 1 and standard distribution 1
- mean 0 and standard distribution 1
- mean 0 and standard distribution 0