Statistique Et Méthodologie De La Recherche Test

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1 / 60

Bivariate Data are the data collected for :

a. More than two variables

b. Two variables at different points of time.

c. Two variables

d. Two variables at the same point of time

2 / 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 -2.

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

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

3 / 60

In regression analysis, the variable that is being predicted is

a. the independent variable

b. slope

c. usually denoted by x

d. the dependent variable

4 / 60

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

a. Discussion

b. Result

c. Method

d. Introduction

5 / 60

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

a. as x increases y increases

b. as x decrease y decreases

c. as x decrease y increases

d. as x increases y decreases

6 / 60

The most commonly used formula to describe linear relationship is?

a. ŷ = b0 + b1x + b2x2

b. ŷ = b0 + b1x

c. ŷ = b0 + b1x+b2

d. ŷ = b0 + b1x2

7 / 60

Quantitative data refers to:

a. any data you present in your report

b. numerical data that could usefully be quantified to help you answer your research question(s) and to meet your objectives

c. graphs and tables.

d. statistical analysis

8 / 60

The coefficient of determination, r2, indicates:

a. The slope of the line of best fit

b. The linear relationship between two variables

c. How closely the data fit a defined curve

d. The sum of the residuals from each data point

9 / 60

Internal “validity” refers to:

a. The extent to which the researcher believes that this was a worthwhile project

b. Whether or not there is really a causal relationship between two variables

c. whether or not the findings are relevant to the researchers' everyday lives.

d. how accurately the measurements represent underlying concepts.

10 / 60

In correlation both variables are always?

a. Random

b. Non Random

c. different

d. same

11 / 60

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

a. Positive

b. Zero

c. Negative

d. Strong

12 / 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 unrelated

d. both are equal

13 / 60

The term regression was used by:

a. Galton

b. Newton

c. Pearson

d. Spearman

14 / 60

Two variables have a positive association when?

a. the values of one variable tend to decrease as the values of the other variable increase.

b. the values of one variable tend to increase as the values of the other variable increase.

c. the values of one variable tend to increase irregard less of how the values of the other variable change.

d. the values of both variables are always positive.

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

c. +1

d. 0.5

16 / 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

17 / 60

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

a. Independent

b. Correlation

c. Dependent

d. Qualitative

18 / 60

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

a. Intercept

b. Slope

c. Slope and Regression coefficient

d. Regression coefficient

19 / 60

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

a. Nonlinear correlation

b. Positive correlation

c. Linear correlation

d. Negative correlation

20 / 60

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

a. Intercept

b. Sum of residual

c. Difficult to tell

d. Slope

21 / 60

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

a. +1

b. -1

c. Negative number

d. 0

22 / 60

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

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

b. can be either -1 or +1

c. must also be equal to 1

d. must be -1

23 / 60

The null hypothesis states the means are:

a. Not equal

b. Alternative hypothesis

c. Research hypothesis

d. Equal

24 / 60

Which of the following are examples of continuous variables?

a. Age in year

b. Distance between

c. Number of children

d. Birth weight of babies

25 / 60

Scatter diagram is considered for measuring :

a. Predict independent variable

b. Curvilinear relationship between two variables

c. Predict dependent variable

d. Linear relationship between two variables

26 / 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 Y on X

c. Regression coefficient of X on Y

d. Correlation coefficient of Y on X

27 / 60

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

a. Partial correlation analysis

b. Inference

c. Regression analysis

d. Correlation analysis

28 / 60

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

a. Descriptive statistics

b. Correlated statistics

c. Regression statistics

d. Inferential statistics

29 / 60

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

a. Positive

b. Negative

c. Zero

d. Undecided

30 / 60

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

a. Correlation is the same as regression

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. Regression enables prediction of the dependent variable

31 / 60

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

a. 9%

b. 30%

c. 70%

d. 10%

32 / 60

The null hypothesis states the means are:

a. Research hypothesis

b. Equal

c. Not equal

d. Alternative hypothesis

33 / 60

A qualitative variable:

a. Always refers to a sample

b. Is not numeric

c. Has many outcomes

d. Has only two possible outcomes

34 / 60

A scatterplot is a ?

a. two-dimensional graph of data values.

b. two-dimensional graph of a straight line.

c. two-dimensional graph of a curved line.

d. one-dimensional graph of randomly scattered data.

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

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

a. Word, Excel

b. Access

c. Stata

d. Excel

37 / 60

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

a. Data retrieval

b. Data presentation

c. Data analysis and interpretation

d. Data promotion

38 / 60

To investigate the association between two categorical variables we use:

a. F-test

b. z-test

c. Chi-squared test

d. t-test

39 / 60

The coefficient of determination (r2) is

a. usually less than zero

b. the square root of the correlation coefficient

c. the correlation coefficient squared

d. 100%

40 / 60

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

a. Variables

b. Estimates

c. Random errors

d. Parameters

41 / 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. measure the difference between two variables.

c. assess whether two variables measure the same phenomenon.

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

42 / 60

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

a. Fail to reject the null hypothesis

b. Strong evidence to reject the null hypothesis

c. Reject the null hypothesis

d. Statistically significant

43 / 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. 0 ≤ r ≤ 1

b. r = +1

c. r ≥ 0

d. r = -1

44 / 60

If the plotted points in a scatter diagram are evenly distributed, then the correlation is :

a. Positive

b. Zero

c. Weak

d. Negative

45 / 60

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

a. 17

b. 4

c. 21

d. 13

46 / 60

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

a. the dependent variable

b. the independent variable

c. usually denoted by y

d. the slope

47 / 60

The coefficient of correlation

a. is the coefficient of determination squared

b. is the square root of the coefficient of determination

c. can never be positive

d. can never be negative

48 / 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. Minimum

d. Positive

49 / 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. The dependent samples t-test

c. Chi-square

d. ANOVA

50 / 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. Minimum

c. Zero

d. Positive

51 / 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

52 / 60

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

a. must be in some unit of weight

b. must also be in kilograms

c. can be any units

d. cannot be in kilograms

53 / 60

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

a. Estimating a statistic.

b. test a hypothesis

c. analyze relationships

d. Estimating a parameter

54 / 60

Which of these is not one of the four main reasons for missing data?

a. The data was not required from the respondent, perhaps because of a skip generated by a filter question in a survey

b. The respondent did not know the answer or did not have an opinion

c. The respondent may have missed a question by mistake.

d. The analyst ignored its presence on the data form.

55 / 60

A t-test is used to compare:

a. 5 means

b. 3 means

c. 2 means

d. 4 means

56 / 60

The regression equation always passes through:

a. Mean X

b. (a, b)

c. mean X, Mean Y

d. (X, Y)

57 / 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.

58 / 60

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

a. standard error

b. coefficient of determination

c. slope of the regression

d. mean square error

59 / 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 negative

b. Negative

c. Perfect positive

d. Zero

60 / 60

If the Pearson Correlation Coefficient shows zero value, it means that:

a. There is a relationship between the two variables

b. There is a strong relationship between the two variables

c. There is no relationship between the two variables

d. There is a weak relationship between the two variables

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Statistique Et Méthodologie De La Recherche Test

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