Statistique Et Méthodologie De La Recherche Test

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1 / 60

Inferential statistics enable you to (Except one):

a. decide if the research hypothesis is true

b. estimate population parameters.

c. decide if your research results are meaningful.

d. decide if the null hypothesis is false

2 / 60

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

a. Same direction

b. Downward direction

c. Upward direction

d. Opposite direction

3 / 60

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

a. -1 and 0

b. -1 and +1

c.  -0-.5 and +0.5

d. 0 and 1

4 / 60

2. A relationship where the flow of the data points is best represented by a curve is called:

a. Nonlinear relationship

b. Linear positive

c. Linear negative

d. Linear relationship

5 / 60

Bivariate Data are the data collected for :

a. More than two variables

b. Two variables

c. Two variables at the same point of time

d. Two variables at different points of time.

6 / 60

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

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

b. On a straight line

c. Under the line

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

7 / 60

51. What is the slope of the line y = -3.4x – 2.5?

a. 2.5

b. -2.5

c. 3.4

d. -3.4

8 / 60

All data points falling along a straight line is called:

a. Linear relationship

b. Scatter diagram

c. Residual

d. Non linear relationship

9 / 60

The coefficient of correlation

a. can never be positive

b. is the coefficient of determination squared

c. is the square root of the coefficient of determination

d. can never be negative

10 / 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

11 / 60

The coefficient of determination is the?

a. ratio of the unexplained deviation to the explained deviation.

b. ratio of the explained variation to the total deviation.

c. ratio of the unexplained deviation to the total variation.

d. ratio of the explained variation to the total variation.

12 / 60

Let the coefficient of determination computed to be 0.39 in a problem involving one independent variable and one dependent variable. This result means that

a. 39% of the total variation is explained by the dependent variable

b. The correlation coefficient is 0.39 also

c. The relationship between two variables is negative

d. 39% of the total variation is explained by the independent variable

13 / 60

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

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

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

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

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

14 / 60

Scatter diagram is considered for measuring :

a. Linear relationship between two variables

b. Predict independent variable

c. Predict dependent variable

d. Curvilinear relationship between two variables

15 / 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. -1

b. 0.5

c. 0

d. +1

16 / 60

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

a. Standard Error or Estimate

b. Coefficient of Determination

c. Coefficient of Correlation

d. Coefficient of Skewness

17 / 60

In scatter diagram, if most of the points lie in the first and third quadrants, then coefficient of correlation is:

a. Constant

b. Positive

c. Negative

d. Zero

18 / 60

The coefficient of determination (r2) is

a. the square root of the correlation coefficient

b. usually less than zero

c. the correlation coefficient squared

d. 100%

19 / 60

Computers are essential for quantitative data analysis because?

a. they enable easy calculation for those of us not too good with figures

b. increasingly data analysis software contain algorithms that check the data for obvious errors as it is entered

c. they are fun to use.

d. they are so powerful

20 / 60

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

a. R2

b. The p-value

c. The f-value

d. The t-value

21 / 60

The strength (degree) of the correlation between a set of independent variables X and a dependent variable Y is measured by

a. Coefficient of Determination

b. Standard error of estimate

c. Coefficient of Correlation

d. Sample size

22 / 60

R2 is used in regression analysis to:

a. Measure model fit

b. Estimate correlation

c. To determine how well the model works

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

23 / 60

In the regression equation Y = a + bX, b is called:

a. Slope and Regression coefficient

b. Regression coefficient

c. Slope

d. Intercept

24 / 60

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

a. must also be equal to 1

b. can be either -1 or +1

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

d. must be -1

25 / 60

If you have 20 pairs of subjects what would be the degrees of freedom for a test of correlation
between the groups of scores?

a. 21

b. 22

c. 20

d. 19

26 / 60

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

a. must also be positive

b. can be zero

c. can be either negative or positive

d. can not be zero

27 / 60

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

a. 0 ≤ r ≤ 1

b. -1 ≤ r ≤ 1

c. r ≥ 1

d. -1 ≤ r

28 / 60

A t-test is used to compare:

a. 2 means

b. 4 means

c. 5 means

d. 3 means

29 / 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.

30 / 60

The null hypothesis states the means are:

a. Not equal

b. Research hypothesis

c. Alternative hypothesis

d. Equal

31 / 60

If regression line of Y= 5, then value of regression coefficient of Y on X is:

a. 1

b. 0

c. 5

d. 0.5

32 / 60

The difference between regression analysis and correlation analysis is (except one):

a. Regression enables prediction of the dependent variable

b. Regression provides measures of association in units of the variable being measured

c. Regression estimates the line of best fit through the data

d. Correlation is the same as regression

33 / 60

When the p-value is less than 0.05 we can conclude that:

a. No evidence to reject the null hypothesis

b. Fail to reject the null hypothesis

c. Reject the null hypothesis

d. No statistically significant

34 / 60

Inferential statistics enable you to :

a. decide if the research hypothesis is true

b. estimate sample size

c. decide collecting data

d. calculate sample size.

35 / 60

The mean, median, mode and standard deviation are examples of:

a. Inferential statistics

b. Descriptive statistics

c. Linear regression statistics

d. Part of experimental studies

36 / 60

The graph showing the paired points of (Xi, Yi) is called:

a. Histogram

b. Historigram

c. Scatter diagram

d. Pie diagram

37 / 60

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

a. Focus group

b. Case report

c. Randomized clinical trial

d. Cross-sectional study

38 / 60

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

a. the independent variable

b. usually denoted by y

c. the dependent variable

d. the slope

39 / 60

The two forms of t-test are:

a. Factorial and interaction

b. Bivariate and multiple

c. One-way and two-way

d. Independent and dependent

40 / 60

Which of the following requirements for a scientific report writing may depend on your
institution (EXCEPT ONE)?

a. Whether an abstract should be included

b. The size of the study

c. The format for referencing

d. Oral presentation

41 / 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. r ≥ 0

d. 0 ≤ r ≤ 1

42 / 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

43 / 60

The coefficient of determination (sometimes known as the regression coefficient) enables you to:

a. assess the strength of relationship between a quantifiable dependent variable and one or more quantifiable independent variables.

b. assess whether two variables measure the same phenomenon.

c. measure the difference between two variables.

d. establish whether the data is telling you what you think it should tell you.

44 / 60

if the correlation coefficient r = 0.5 then the coefficient of determination is?

a. 2.50

b. 0.25

c. 1.00

d. 0.10

45 / 60

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

a. Perfect correlation

b. Perfect negative

c. Weak

d. Strong

46 / 60

Method is used to infer that the results from a sample are reflective of the true population
scores. ?

a. Regression statistics

b. Descriptive statistics

c. Inferential statistics

d. Correlated statistics

47 / 60

Scatter diagram helps us to :

a. Compute the extent of correlation between two variables

b. Calculate slop

c. Obtain the mathematical relationship between two variables

d. Find the nature correlation between two variables

48 / 60

A qualitative variable:

a. Has many outcomes

b. Always refers to a sample

c. Has only two possible outcomes

d. Is not numeric

49 / 60

In the regression equation y = bo + b1x1, b1 is the

a. slope of the line

b. independent variable

c. y intercept

d. parameter

50 / 60

A scatterplot is a ?

a. two-dimensional graph of a curved line.

b. one-dimensional graph of randomly scattered data.

c. two-dimensional graph of data values.

d. two-dimensional graph of a straight line.

51 / 60

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

a. Zero

b. Undecided

c. Negative

d. Positive

52 / 60

Correlation analysis aims at :

a. Investigate cause of outcome

b. Predicting one variable for a given value of the other variable

c. Establishing relation between two variables

d. Measuring the extent of relation between two variables

53 / 60

An alternative to statistical techniques for analysis of data to find patterns and trends is?

a. Data mapping

b. Data analysis

c. Data trending

d. Data mining

54 / 60

Which of the following statements is true?

a. The coefficient of determination can have values from 0 to 1.

b. The coefficient of determination can have values from –1 to 1.

c. The coefficient of determination can have values from –1 to -2.

d. The coefficient of determination can have values from 1 to 2

55 / 60

When the ratio of variations in the related variables is constant, it is called:

a. Positive correlation

b. Nonlinear correlation

c. Negative correlation

d. Linear correlation

56 / 60

If the slope of the regression equation y = bo + b1x is positive, then

a. as x decrease y increases

b. as x increases y decreases

c. as x increases y increases

d. as x decrease y decreases

57 / 60

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

a. Error

b. Regression equation

c. Slope

d. Intercept

58 / 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

59 / 60

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

a. Negative

b. Zero

c. Positive

d. Minimum

60 / 60

The mean of a sampling distribution of a sample statistic is called :

a. the central limit.

b. the standard error.

c. the mean of the means.

d. the expected value

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Statistique Et Méthodologie De La Recherche Test

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