What shape does the curve of a normal distribution have?
Correct answer A. Bell shaped
Subject / 721 questions
Statistics MCQs
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When the sums of odd powers of deviations from the mean are zero, what is the distribution called?
Correct answer C. Normal
A normal distribution has µ = 241 and σ = 2. What is P(X ≥ 235)?
Correct answer A. 0.9986
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In a skewed distribution, the mean, median and mode are?
Correct answer B. Different
What is the value of P(µ − σ ≤ X ≤ µ + σ) for a normal distribution?
Correct answer C. 0.6826
The sum of squared deviations is least when deviations are measured from the?
Correct answer B. A.M.
Apart from the variance, which quantity determines the normal distribution’s form?
Correct answer B. µ
For a normal distribution, mean deviation equals what fraction of the standard deviation?
Correct answer D. 4/5
How many parameters does a normal distribution have?
Correct answer C. 2 parameters
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From which value is the standard deviation always calculated?
Correct answer D. Mean
For 40 observations the variance is 50. If every observation is increased by 20, what is the variance of the new observations?
Correct answer B. 50
Over what range of values is a normal distribution defined?
Correct answer B. -∞ to +∞
What is the second moment about the mean?
Correct answer B. Variance
A frequency distribution in which mean > median > mode is described as?
Correct answer C. Positively skewed
In a standard normal distribution, which measure does z = 0 correspond to?
Correct answer D. Mean
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Which is a poor measure of dispersion for an open-ended distribution?
Correct answer B. Range
Because the normal distribution is symmetrical, what is true of its mean, median and mode?
Correct answer C. They coincide
If y = bx + c, what is the range of y?
Correct answer C. |b| × range of x
At what value of X does the normal density function reach its maximum?
Correct answer A. X = µ
If y = ax + b, what is the standard deviation of y?
Correct answer C. |a| × S.D. of x