Statistique Et Méthodologie De La Recherche Test

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1 / 60

If all the values fall on the same straight line and the line has a positive slope then what will be
the value of the correlation coefficient ‘r’:

a. r = -1

b. r = +1

c. 0 ≤ r ≤ 1

d. r ≥ 0

2 / 60

Inferential statistics enable you to :

a. decide conducting interview

b. estimate population parameters.

c. decide conducting research

d. decide analysis data

3 / 60

To investigate the association between two categorical variables we use:

a. Chi-squared test

b. F-test

c. t-test

d. z-test

4 / 60

The measure of how well the regression line fits the data is the:

a. standard error

b. mean square error

c. slope of the regression

d. coefficient of determination

5 / 60

In simple linear regression, the numbers of unknown constants are:

a. One

b. Three

c. Two

d. Four

6 / 60

Which of the following statements regarding a researcher’s use of inferential statistics is
true?

a. A random sample provides a perfect estimate of the population values.

b. It is best to measure every member of a population if possible

c. Descriptive statistics from a sample are used to estimate the characteristics of the population.

d. We usually need to take several samples to obtain a good estimate of the population values.

7 / 60

Inferential statistics is a process that involves all of the following EXCEPT:

a. analyze relationships

b. Estimating a statistic.

c. Estimating a parameter

d. test a hypothesis

8 / 60

In regression analysis, if the independent variable is measured in kilograms, the dependent
variable:

a. must also be in kilograms

b. can be any units

c. must be in some unit of weight

d. cannot be in kilograms

9 / 60

The null hypothesis states the means are:

a. Research hypothesis

b. Equal

c. Not equal

d. Alternative hypothesis

10 / 60

The slope of the regression line of Y on X is also called the:

a. Regression coefficient of Y on X

b. Regression coefficient of X on Y

c. Correlation coefficient of X on Y

d. Correlation coefficient of Y on X

11 / 60

1. The method of least squares dictates that we choose a regression line where the sum of the
square of deviations of the points from the lie is:

a. Positive

b. Maximum

c. Zero

d. Minimum

12 / 60

The most commonly used formula to describe linear relationship is?

a. ŷ = b0 + b1x2

b. ŷ = b0 + b1x+b2

c. ŷ = b0 + b1x + b2x2

d. ŷ = b0 + b1x

13 / 60

The regression equation always passes through:

a. Mean X

b. (X, Y)

c. mean X, Mean Y

d. (a, b)

14 / 60

Negative regression coefficient indicates that the movement of the variables are in:

a. Difficult to tell

b. Same and opposite direction

c. Opposite direction

d. Same direction

15 / 60

If the coefficient of determination is equal to 1, then the correlation coefficient:

a. can be any value between -1 to +1

b. must be -1

c. can be either -1 or +1

d. must also be equal to 1

16 / 60

The two forms of t-test are:

a. Independent and dependent

b. Factorial and interaction

c. Bivariate and multiple

d. One-way and two-way

17 / 60

In regression analysis, the variable that is doing the predicting or explaining is

a. the slope

b. the independent variable

c. usually denoted by y

d. the dependent variable

18 / 60

The total variation explained by a regression model is given by:

a. The f-value

b. The t-value

c. R2

d. The p-value

19 / 60

Correlation analysis is used to:

a. Simultaneously compare the effect of multiple independent variables on a dependent variable

b. Predict values of y based on values of x

c. Measure the strength of association between two variables

d. Analyse data

20 / 60

Relationship between correlation coefficient and coefficient of determination is that?

a. both are unrelated

b. The coefficient of determination is the square root of the coefficient of correlation

c. both are equal

d. The coefficient of determination is the coefficient of correlation squared

21 / 60

Correlation and regression are concerned with ?

a. the relationship between a quantitative explanatory variable and a categorical response variable.

b. the relationship between two categorical variables.

c. the relationship between two quantitative variables.

d. the relationship between a categorical explanatory variable and a quantitative response variable.

22 / 60

Which of the following are examples of continuous variables?

a. Distance between

b. Age in year

c. Number of children

d. Birth weight of babies

23 / 60

In simple linear regression model Y = α + βX + ε where α and β are called

a. Parameters

b. Random errors

c. Variables

d. Estimates

24 / 60

When regression line passes through the origin, then:

a. Correlation is zero

b. Intercept is zero

c. Regression coefficient is zero

d. Association is zero

25 / 60

When correlation coefficient is 1, all the points in a scatter diagram would lie?

a. On a straight line

b. On a straight line directed from upper left to lower right

c. On a straight line directed from lower left to upper right

d. Under the line

26 / 60

My estimated regression line is Y = 17 + 4X. The intercept is equal to:

a. 17

b. 4

c. 13

d. 21

27 / 60

If the coefficient of determination is 0.81, the correlation coefficient:

a. could be either + 0.9 or – 0.9

b. is 0.6561

c. must be negative

d. must be positive

28 / 60

A t-test is used to compare:

a. 3 means

b. 2 means

c. 4 means

d. 5 means

29 / 60

Which part of written report that can answer the research question?

a. Discussion

b. Result

c. Introduction

d. Method

30 / 60

If two variables have a correlation coefficient of .30, what percentage of one variable is
accounted for by the other variable?

a. 70%

b. 30%

c. 10%

d. 9%

31 / 60

R2 is used in regression analysis to:

a. Measure model fit

b. Measure the amount of variance in the dependent variable explained by variation in the independent variables

c. To determine how well the model works

d. Estimate correlation

32 / 60

If the points on the scatter diagram show no tendency either to increase together or decrease together the value of r will be close to:

a. 0.5

b. -1

c. +1

d. 0

33 / 60

An example of an experimental study is a(n):

a. Focus group

b. Cross-sectional study

c. Randomized clinical trial

d. Case report

34 / 60

A Type I error occurs when the null hypothesis is:

a. accepted and null hypothesis is actually true.

b. Rejected and the research hypothesis is actually false.

c. rejected and null hypothesis is actually true.

d. accepted but and research hypothesis is actually true.

35 / 60

A procedure used to select a sample of n objects from a population in such a way that each
member of the population is chosen strictly by chance, each member of the population is equally
likely to be chosen, and every possible sample of a given size, n, has the same chance of selection
is known as:

a. statistical analysis.

b. Simple random sampling

c. descriptive statistics.

d. statistical thinking.

36 / 60

A perfect positive correlation is signified by:

a. -1

b. -1 to +1

c. 0

d. +1

37 / 60

In regression analysis, the variable that is being predicted is the:

a. is usually x

b. response, or dependent, variable

c. independent variable

d. intervening variable

38 / 60

If one item is fixed and unchangeable and the other item varies, the correlation coefficient will be:

a. Undecided

b. Zero

c. Positive

d. Negative

39 / 60

If a study is “reliable”, this means that:

a. the methods are outlined in the methods discussion clearly enough for the research to be replicated.

b. he measures devised for concepts are stable on different occasions.

c. it was conducted by a reputable researcher who can be trusted

d. the findings can be generalized to other social phenomena

40 / 60

The sum of the difference between the actual values of Y and its values obtained from the fitted regression line is always:

a. Zero

b. Minimum

c. Positive

d. Negative

41 / 60

The correlation coefficient, r, can take on any value within what range?

a. -1 ≤ r

b. r ≥ 1

c. -1 ≤ r ≤ 1

d. 0 ≤ r ≤ 1

42 / 60

Bivariate Data are the data collected for :

a. Two variables at different points of time.

b. More than two variables

c. Two variables

d. Two variables at the same point of time

43 / 60

If the value of any regression coefficient is zero, then two variables are:

a. Independent

b. Dependent

c. Correlation

d. Qualitative

44 / 60

Which of the following statements is true regarding a sample?

a. It refers to descriptive statistics

b. It must contain at least five observations

c. It refers to estimation

d. It is a part of population

45 / 60

A scatter plot?

a. Shows a continuous relationship between two variables over time

b. Shows a (negative or positive) relationship or correlation between 2 variables and how they interact

c. Is used to compare parts to the whole or to compare the total with each part or percentage

d. Is useful in comparing differences in magnitude of different variables

46 / 60

If the points on the scatter diagram indicate that as one variable increases the other variable tends to decrease the value of r will be:

a. Perfect positive

b. Perfect negative

c. Negative

d. Zero

47 / 60

The percent of total variation of the dependent variable Y explained by the set of independent variables X is measured by

a. Coefficient of Determination

b. Coefficient of Correlation

c. Coefficient of Skewness

d. Standard Error or Estimate

48 / 60

An r value of 0.80 indicates:

a. Correlation but not linear

b. No linear correlation

c. Perfect linear correlation

d. Strong linear correlation

49 / 60

31. The value of the coefficient of correlation r lies between:

a.  -0-.5 and +0.5

b. 0 and 1

c. -1 and +1

d. -1 and 0

50 / 60

The best fitting trend is one for which the sum of squares of error is?

a. Minimum (Least)

b. Maximum

c. Less than 1

d. Zero

51 / 60

The predicted rate of response of the dependent variable to changes in the independent variable
is called:

a. Slope

b. Error

c. Regression equation

d. Intercept

52 / 60

If all the plotted points in a scatter diagram lie on a single line, then the correlation is :

a. Perfect correlation

b. Weak

c. Perfect negative

d. Strong

53 / 60

If the correlation coefficient is a positive value, then the slope of the regression line:

a. can be either negative or positive

b. can not be zero

c. must also be positive

d. can be zero

54 / 60

The arithmetic mean of the two regression coefficients is greater than or equal to:

a. r

b. 0

c. +1

d. -1

55 / 60

If Y = 2 – 0.2X, then the value of Y intercept is equal to:

a. -0.2

b. 0.2X

c. -2

d. 2

56 / 60

The straight line graph of the linear equation Y = a + bX, slope is horizontal if:

a. b = 0

b. b = 1

c. a = b

d. b ≠ 0

57 / 60

Which Statistical software come with appropriate table, graph, and/or chart-building
features to easily convert tabular data into a variety of formats.?

a. Excel

b. Word, Excel

c. Stata

d. Access

58 / 60

The coefficient of determination (r2) is

a. the correlation coefficient squared

b. 100%

c. the square root of the correlation coefficient

d. usually less than zero

59 / 60

The dependent variable is also called except one:

a. Independent variable

b. Predictand variable

c. Regressand variable

d. Explained variable

60 / 60

The value of the coefficient of determination (r2) ranges between

a. 1 to infinity

b. 0 to +1

c. -1 to 0

d. -1 to +1

Your score is

The average score is 0%

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Statistique Et Méthodologie De La Recherche Test

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