Question 1

Statistics is the study of _______ measures of the values associated with variables
A)verbal
B)pictorial
C)descriptive
D)numerical

Accepted Answer

Statistics is primarily concerned with numerical measures, as it involves the collection, analysis, interpretation, presentation, and organization of data in numerical form.

Question 2

'Primary source data is better than secondary source data'. This statement is
A) true
B) false
C) neither true nor false
D) any of the above

Accepted Answer

B

Question 3

Celsius and Fahrenheit temperature scales are examples of interval levels of measurement
A) true
B) false
C) neither true nor false
D) any of the above

Accepted Answer

Celsius and Fahrenheit are indeed examples of interval levels of measurement because they have meaningful distances between measurements but no true zero point.

Question 4

The number of students on a college campus is a continuous variable
A) true
B) false
C) neither true nor false

Accepted Answer

The number of students on a college campus is a discrete variable because it can only take integer values (you can't have a fraction of a student), making the statement false.

Question 5

______refer to population characteristics while _____describe sample characteristics
A)statistic, parameter
B)parameter, statistic
C)regression, correlation
D)correlation, regression

Accepted Answer

Parameters refer to population characteristics, while statistics describe sample characteristics.

Question 6

You are conducting a study to see whether a new experimental medication will cause bald men to grow hair. You divide your patients into 2 groups. To one group you give the medication. To the other group, you give a placebo. In this study, the correct terms for the taking of the medication and the growth of hair are the following.
A)both the medication and the hair growth are dependent variables
B)both the medication and the hair growth are independent variables
C)the medication is the dependent variable, and the hair growth is the independent variable
D)the medication is the independent variable, and the hair growth is the dependent variable

Accepted Answer

In this study, the medication is the independent variable because it is the condition being manipulated or changed by the researcher. The hair growth is the dependent variable because it is the outcome being measured to see if it changes in response to the manipulation of the independent variable (the medication).

Question 7

The concept of a variable implies that the values of every characteristic of an item are different
A) true
B) false
C) neither true nor false
D) any of the above

Accepted Answer

The concept of a variable implies that the values it can take on might vary among the items being studied, not that every characteristic must be different for each item.

Question 8

Which of the following definitions is the definition of the MEAN
A)the mean is the largest value
B)the mean is the value that half of the entries are below and half of the entries are above
C)the mean is the value that has the highest frequency
D)the mean is the average calculated by adding up all the values and dividing by the number

Accepted Answer

The mean is defined as the average of a set of numbers, calculated by adding all the values together and then dividing by the number of values.

Question 9

Which of the following definitions is the definition of the MEDIAN?
A)the median is the value that half of the entries are below and half of the entries are above
B)the median is the value that has the highest frequency
C)the median is the largest value
D)the median is the average calculated by adding up all the values and dividing by the

Accepted Answer

The median is defined as the middle value in a data set when it is ordered in ascending or descending order, such that half of the data points are below it and half are above it.

Question 10

What is the median of the following set of numbers? {12,8,13,4,7,6,3,3,15}
A)12
B)8
C)7
D)7.5

Accepted Answer

First, arrange the numbers in ascending order: {3, 3, 4, 6, 7, 8, 12, 13, 15}. The median is the middle number, which is 7.

Question 11

A teacher had 5 students who took a test. Their test scores are as follows: 62, 86, 72, 66, 72. What is the mode of the test
A)72
B)86
C)62
D)86.

Accepted Answer

The mode is the number that appears most frequently in a data set. In this case, 72 appears twice, making it the mode.

Question 12

Students A,B and C took part in a recent quiz. Student A scored 50 points, Student B scored 60 points and Student C scored 70 points. What is the mean of this quiz
A)60
B)50
C)70
D)45

Accepted Answer

The mean is calculated by adding all the scores together and then dividing by the number of scores. So, (50 + 60 + 70) / 3 = 180 / 3 = 60.

Question 13

Contestants of a competition have reached the semi-finals. After the semi-finals, their score are of below. Those whose score is lower than the median will not be able to enter the finals, so who managed to enter the finals. Here is the list of contestants: Anoop - 70 Points, Babu - 50 Points, Cindu - 65 Points, Das - 90 Points, Emy - 55 Points, Fasna - 85 Points, Gopi - 100 Points
A)babu, cindu and emy
B)anoop, das, fasnn and gopi
C)anoop, babu, cindu and emy
D)babu, cindu, das, gopi

Accepted Answer

The median score is determined by arranging the scores in ascending order: 50, 55, 65, 70, 85, 90, 100. With seven scores, the median is the fourth score, which is 70. Contestants with scores higher than the median (70) are Anoop (70), Das (90), Fasna (85), and Gopi (100).

Question 14

What is the median in the following numbers: 19, 21, 18, 17, 18, 22, 46
A)19
B)18
C)17
D)21

Accepted Answer

The median is the middle number in a sorted, ascending or descending, list of numbers. First, we sort the numbers: 17, 18, 18, 19, 21, 22, 46. With seven numbers, the fourth number is the median, which is 19.

Question 15

A teacher had 5 students who took a test. Their test scores are as follows: 62, 86, 72, 66, 72. What is the mode of the test
A)72
B)86
C)62
D)66

Accepted Answer

The mode is the number that appears most frequently in a data set. In this case, 72 appears twice, making it the mode.

Question 16

Which of the curves is more peaked than the normal curve?
A)mesokurtic
B)platykurtic
C)lapokurtic
D)skewness

Accepted Answer

The correct term for a distribution that is more peaked than the normal curve is "leptokurtic," not "lapokurtic." However, given the options and likely a typo, option C is the closest. Leptokurtic distributions have a higher peak and fatter tails compared to a normal (mesokurtic) distribution.

Question 17

What will be the range of "r" when we find that the dependent variable increases as the independent variable increases
A)0 to -0.05
B)1 to 2
C)0.1 to 1
D)2 to 3

Accepted Answer

The range of "r" (correlation coefficient) when the dependent variable increases as the independent variable increases is from 0.1 to 1, indicating a positive correlation.

Question 18

Which of the following correlation coefficients shows the highest degree of association
A)?1
B)1
C)0.9
D)both a & b

Accepted Answer

Correlation coefficients range from -1 to 1, where -1 indicates a perfect negative correlation, 1 indicates a perfect positive correlation, and 0 indicates no correlation. Both -1 and 1 represent the highest degree of association (perfect correlation), but in opposite directions.

Question 19

The sum of deviations taken from arithmetic mean is
A)minimum
B)zero
C)maximum
D)none of the above is possible

Accepted Answer

The sum of deviations from the arithmetic mean is always zero, because the arithmetic mean is the point at which the total distances of values above it are exactly balanced by the total distances of values below it.

Question 20

Which of the following statements is not correct
A)extreme value in data affects the mean
B)mean is also known as average
C)some data sets do not have mean
D)at times weighted mean is much better than the simple mean

Accepted Answer

All data sets that consist of numerical values have a mean, as the mean is calculated by summing all the values and dividing by the number of values. Therefore, the statement that some data sets do not have a mean is incorrect.

Quiz 2: Statistics and Data Analysis Basics

Statistics is the study of _______ measures of the values associated with variables

'Primary source data is better than secondary source data'. This statement is

Celsius and Fahrenheit temperature scales are examples of interval levels of measurement

The number of students on a college campus is a continuous variable

__refer to population characteristics while _describe sample characteristics

The concept of a variable implies that the values of every characteristic of an item are different

Which of the following definitions is the definition of the MEAN

Which of the following definitions is the definition of the MEDIAN?

What is the median of the following set of numbers? {12,8,13,4,7,6,3,3,15}

A teacher had 5 students who took a test. Their test scores are as follows: 62, 86, 72, 66, 72. What is the mode of the test

Students A,B and C took part in a recent quiz. Student A scored 50 points, Student B scored 60 points and Student C scored 70 points. What is the mean of this quiz

What is the median in the following numbers: 19, 21, 18, 17, 18, 22, 46

A teacher had 5 students who took a test. Their test scores are as follows: 62, 86, 72, 66, 72. What is the mode of the test

Which of the curves is more peaked than the normal curve?

What will be the range of "r" when we find that the dependent variable increases as the independent variable increases

Which of the following correlation coefficients shows the highest degree of association

The sum of deviations taken from arithmetic mean is

Which of the following statements is not correct