Statistique Et Méthodologie De La Recherche Test

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1 / 60

A statistical technique that develops an equation that relates a dependent variable to one or
more independent variables is called:

a. Inference

b. Regression analysis

c. Correlation analysis

d. Partial correlation analysis

2 / 60

If two variables, x and y, have a very strong linear relationship, then:

a. there might not be any causal relationship between x and y

b. there is evidence that y causes a change in x

c. There is large correlation coefficient

d. there is evidence that x causes a change in y

3 / 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

4 / 60

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

a. 1

b. 5

c. 0

d. 0.5

5 / 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. Zero

b. Maximum

c. Positive

d. Minimum

6 / 60

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

a. 21

b. 13

c. 4

d. 17

7 / 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

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

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

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

9 / 60

If the correlation coefficient is 0.8, the percentage of variation in the response variable explained
by the variation in the explanatory variable is:

a. 64%

b. 0.64%

c. 0.80%

d. 80%

10 / 60

The step in the data analysis process is (EXCEPT ONE):

a. Data promotion

b. Data presentation

c. Data analysis and interpretation

d. Data retrieval

11 / 60

The null hypothesis states the means are:

a. Research hypothesis

b. Equal

c. Not equal

d. Alternative hypothesis

12 / 60

If the plotted points in a scatter diagram lie from upper left to lower right, then the correlation
is :

a. Zero

b. Strong

c. Positive

d. Negative

13 / 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. Zero

c. Perfect negative

d. Negative

14 / 60

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

a. -1 and +1

b. -1 and 0

c.  -0-.5 and +0.5

d. 0 and 1

15 / 60

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

a. Estimates

b. Random errors

c. Variables

d. Parameters

16 / 60

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

a. Independent variable

b. Y-intercept

c. X-intercept

d. Dependent variable

17 / 60

Inferential statistics are useful for:

a. Construct validity

b. Determining the probability of something

c. Observing natural behavior

d. Interviews

18 / 60

If a researcher conducts a study in which the reading ability of a class of 20 second graders is
tested at the beginning and at the end of the year, the appropriate statistical procedure to
analyze the results would be:

a. ANCOVA

b. ANOVA

c. The dependent samples t-test

d. Chi-square

19 / 60

In the regression equation y = bo + bx, bo is the

a. parameter

b. independent variable

c. y intercept

d. slope of the line

20 / 60

When regression line passes through the origin, then:

a. Regression coefficient is zero

b. Correlation is zero

c. Intercept is zero

d. Association is zero

21 / 60

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

a. Under the 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. On a straight line

22 / 60

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

a. cannot be in kilograms

b. must also be in kilograms

c. must be in some unit of weight

d. can be any units

23 / 60

R2 is used in regression analysis to:

a. Measure model fit

b. To determine how well the model works

c. Estimate correlation

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

24 / 60

An r value of 0.80 indicates:

a. No linear correlation

b. Strong linear correlation

c. Correlation but not linear

d. Perfect linear correlation

25 / 60

In descriptive statistics our main objective is to:

a. Describe the population

b. Infer something about the population

c. Describe the data we collected

d. Draw conclusion

26 / 60

The value we would predict for the dependent variable when the independent variables are all
equal to zero is called:

a. Sum of residual

b. Intercept

c. Slope

d. Difficult to tell

27 / 60

Relationship between correlation coefficient and coefficient of determination is that?

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

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

c. both are equal

d. both are unrelated

28 / 60

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

a. Intercept

b. Error

c. Regression equation

d. Slope

29 / 60

The regression equation always passes through:

a. (a, b)

b. mean X, Mean Y

c. (X, Y)

d. Mean X

30 / 60

Inferential statistics enable you to :

a. decide if the research hypothesis is true

b. decide collecting data

c. calculate sample size.

d. estimate sample size

31 / 60

In correlation both variables are always?

a. same

b. different

c. Non Random

d. Random

32 / 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 Skewness

c. Standard Error or Estimate

d. Coefficient of Correlation

33 / 60

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

a. Correlation coefficient of X on Y

b. Regression coefficient of X on Y

c. Regression coefficient of Y on X

d. Correlation coefficient of Y on X

34 / 60

A process by which we estimate the value of dependent variable on the basis of one or more
independent variables is called:

a. Residual

b. Regression

c. Slope

d. Correlation

35 / 60

The coefficient of correlation

a. can never be negative

b. is the coefficient of determination squared

c. is the square root of the coefficient of determination

d. can never be positive

36 / 60

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

a. Continuous variable

b. Independent variable

c. Estimate

d. Dependent variable

37 / 60

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

a. Positive

b. Zero

c. Negative

d. Minimum

38 / 60

The straight line graph of the linear equation Y = a + bX, slope will be downward If:

a. b smaller than 0

b. b = 0

c. b ≠ 0

d. b larger than 0

39 / 60

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

a. Linear relationship

b. Nonlinear relationship

c. Linear negative

d. Linear positive

40 / 60

Inferential statistics enable you to (Except one):

a. decide if the null hypothesis is false

b. decide if the research hypothesis is true

c. decide if your research results are meaningful.

d. estimate population parameters.

41 / 60

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

a. Introduction

b. Discussion

c. Result

d. Method

42 / 60

The correlation coefficient is used to determine:

a. A specific value of the x-variable given a specific value of the y-variable

b. The estimation parameter

c. The strength of the relationship between the x and y variables

d. A specific value of the y-variable given a specific value of the x-variable

43 / 60

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

a. must also be equal to 1

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

c. must be -1

d. can be either -1 or +1

44 / 60

Scatter diagram is considered for measuring :

a. Predict dependent variable

b. Linear relationship between two variables

c. Curvilinear relationship between two variables

d. Predict independent variable

45 / 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. Access

c. Stata

d. Word, Excel

46 / 60

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

a. Correlation is the same as regression

b. Regression enables prediction of the dependent variable

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

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

47 / 60

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

a. b = 1

b. b = 0

c. b ≠ 0

d. a = b

48 / 60

When there is no linear correlation between two variables, what will the value of r be?

a. Negative number

b. +1

c. 0

d. -1

49 / 60

The degree of linear association between two metric scaled variables is measured by:

a. analysis of variance

b. significance level

c. Pearson correlation coefficient

d. β

50 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Different

b. Negative

c. Same

d. Positive

51 / 60

If the two series move in reverse directions and the variations in their values are always proportionate, it is said to be:

a. Positive correlation

b. Negative correlation

c. Perfect positive correlation

d. Perfect negative correlation

52 / 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

53 / 60

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

a. the central limit.

b. the expected value

c. the standard error.

d. the mean of the means.

54 / 60

Which of the following statements is true regarding a sample?

a. It refers to estimation

b. It refers to descriptive statistics

c. It is a part of population

d. It must contain at least five observations

55 / 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

56 / 60

Scatter diagram helps us to :

a. Calculate slop

b. Compute the extent of correlation between two variables

c. Find the nature correlation between two variables

d. Obtain the mathematical relationship between two variables

57 / 60

If both variables X and Y increase or decrease simultaneously, then the coefficient of correlation will be:

a. Zero

b. One

c. Positive

d. Negative

58 / 60

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

a. One

b. Three

c. Four

d. Two

59 / 60

Which of the following statements is true?

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

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

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

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

60 / 60

In simple regression equation, the numbers of variables involved are:

a. 1

b. 0

c. 2

d. 3

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Statistique Et Méthodologie De La Recherche Test

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