A Student Of Statistics? This Is A Quiz For You, Then!
12 Questions
| Total Attempts: 459
A descriptive statistic is a summary statistic that quantitatively describes or summarizes features from a collection of information, while descriptive statistics is the process of using and analysing those statistics.
Questions and Answers
- 1.Which one is better: mean, median or mode?
- A.
Mean
- B.
Median
- C.
Mode
- D.
Depends on your goals
- 2.What is the median of the data set: 4, 3, 1, 2, 6, 3, 4, 5, 2, 6, 4, 3, 3, 3, 6, 4, 6, 4, 2, 6?
- A.
4
- B.
6
- C.
5
- D.
3.5
- 3.True or false: When the word "mean" is used without a modifier, it can be assumed that it refers to the arithmetic mean.
- A.
True
- B.
False
- 4.The mean is the sum of all the scores _________ the number of scores.
- A.
Except for
- B.
Multiplied by
- C.
Subtracted from
- D.
Divided by
- E.
Except from
- 5.What is the standard deviation of the following (complete) population? 2, 4, 4, 4, 5, 5, 7, 9
- A.
4
- B.
4.5
- C.
5
- D.
2
- E.
There is not enough information to determine standard deviation
- 6.The difference in the formula for standard deviation between a complete population and an incomplete population is:
- A.
Mean plus 1
- B.
Mean minus 1
- C.
Numerator minus
- D.
Denominator minus 1
- 7.To calculate standard deviation in Microsoft Excel, you first have to calculate the "average."
- A.
True
- B.
False
- C.
This is a trick question
- 8.In probability theory and statistics, the normal distribution or Gaussian distribution is an absolutely continuous probability distribution with zero cumulants of all orders higher than two. The graph of the associated probability density function is bell-shaped, with a peak at the mean, and is known as the Gaussian function or bell curve.
- A.
True
- B.
False
- 9.Not all normal distributions are symmetric and have bell-shaped density curves with a single peak.
- A.
True
- B.
False
- 10.For a normal distribution, almost all values lie within ___ standard deviations of the mean.
- A.
4
- B.
5
- C.
2
- D.
3
- 11.Calculate normal distribution: If X is a normal random variable with mean (m) 100 and standard deviation (σ) 6 find P(X<106)
- A.
P = 0.1
- B.
P = 0.8413
- C.
P = 94
- D.
There is not enough information to solve this problem.
- 12.Using a z-table, determine the area under the curve between 0 and 1.27
- A.
0.3962
- B.
0.4909
- C.
0.398
- D.
There is not enough information to answer this question
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