A Student Of Statistics? This Is A Quiz For You, Then!

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| By Sperberm08

Sperberm08

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Quizzes Created: 1 | Total Attempts: 646

| Attempts: 646

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1/12 Questions

The mean is the sum of all the scores _________ the number of scores.
- Except for
- Multiplied by
- Subtracted from
- Divided by
- Except from

About This Quiz

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.

2.

True or false: When the word "mean" is used without a modifier, it can be assumed that it refers to the arithmetic mean.
- True
- False
Correct Answer

A. True

Explanation

The arithmetic mean is what is commonly called the average: When the word "mean" is used without a modifier, it can be assumed that it refers to the arithmetic mean. The mean is the sum of all the scores divided by the number of scores.

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3.

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.
- True
- False
Correct Answer

A. True

Explanation

This is true. See: http://en.wikipedia.org/wiki/Normal_distribution#Definition

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4.

Which one is better: mean, median or mode?
- Mean
- Median
- Mode
- Depends on your goals
Correct Answer

A. Depends on your goals

Explanation

Please read the following page for a more thorough explanation: http://www.shodor.org/interactivate/discussions/MeanMedianAndMode/

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5.

To calculate standard deviation in Microsoft Excel, you first have to calculate the "average."
- True
- False
- This is a trick question
Correct Answer

A. True

Explanation

This is true. See: http://www.gifted.uconn.edu/siegle/research/Normal/stdexcel.htm

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6.

Not all normal distributions are symmetric and have bell-shaped density curves with a single peak.
- True
- False
Correct Answer

A. False

Explanation

This is false. By definition, all *normal* distributions are symmetric and have bell-shaped density curves with a single peak.

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7.

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?
- 4
- 6
- 5
- 3.5
Correct Answer

A. 4

Explanation

you sort the numbers first: 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 6, 6, 6, 6, 6 eggs. There is an even number of values, so the middle (or median) is between the first and second 4 (the 10th and 11th values). Because they are the same, their average is also 4, so the median is 4.

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8.

The difference in the formula for standard deviation between a complete population and an incomplete population is:
- Mean plus 1
- Mean minus 1
- Numerator minus
- Denominator minus 1
Correct Answer

A. Denominator minus 1

Explanation

See this link for more info: http://en.wikipedia.org/wiki/Standard_deviation#Basic_example

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9.

What is the standard deviation of the following (complete) population? 2, 4, 4, 4, 5, 5, 7, 9
- 4
- 4.5
- 5
- 2
- There is not enough information to determine standard deviation
Correct Answer

A. 2

Explanation

See here for an explanation: http://en.wikipedia.org/wiki/Standard_deviation#Basic_example

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2
10.

Calculate normal distribution: If X is a normal random variable with mean (m) 100 and standard deviation (σ) 6 find P(X<106)
- P = 0.1
- P = 0.8413
- P = 94
- There is not enough information to solve this problem.
Correct Answer

A. P = 0.8413

Explanation

Step 1: For a given value X=106
Z = (106-100)/6
= 1

Step 2: Find the value of 1 in Z table
Z = 1 = 0.3413

Step 3: Here the X value is greater than mean
P(X) = 0.5 + 0.3413 = 0.8413

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11.

For a normal distribution, almost all values lie within ___ standard deviations of the mean.
- 4
- 5
- 2
- 3
Correct Answer

A. 3

Explanation

If you got this incorrect, please review the section on normal distribution.

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12.

Using a z-table, determine the area under the curve between 0 and 1.27
- 0.3962
- 0.4909
- 0.398
- There is not enough information to answer this question
Correct Answer

A. 0.3962

Explanation

Please see this z-table and explanation of how to use it: http://www.easycalculation.com/statistics/normal-ztable.php

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1

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Mar 22, 2023

Quiz Edited by
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Jun 02, 2010

Quiz Created by
Sperberm08

A Student Of Statistics? This Is A Quiz For You, Then!

The mean is the sum of all the scores _________ the number of scores.

Quiz Preview

True or false: When the word "mean" is used without a modifier, it can be assumed that it refers to the arithmetic mean.

Which one is better: mean, median or mode?

To calculate standard deviation in Microsoft Excel, you first have to calculate the "average."

Not all normal distributions are symmetric and have bell-shaped density curves with a single peak.

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?

The difference in the formula for standard deviation between a complete population and an incomplete population is:

What is the standard deviation of the following (complete) population? 2, 4, 4, 4, 5, 5, 7, 9

Calculate normal distribution: If X is a normal random variable with mean (m) 100 and standard deviation (σ) 6 find P(X<106)

For a normal distribution, almost all values lie within ___ standard deviations of the mean.

Using a z-table, determine the area under the curve between 0 and 1.27