Statistique Et Méthodologie De La Recherche Test

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1 / 60

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

a. Positive correlation

b. Negative correlation

c. Nonlinear correlation

d. Linear correlation

2 / 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. Stata

b. Excel

c. Access

d. Word, Excel

3 / 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. The dependent samples t-test

b. Chi-square

c. ANOVA

d. ANCOVA

4 / 60

To investigate the association between two categorical variables we use:

a. Chi-squared test

b. F-test

c. z-test

d. t-test

5 / 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 variation.

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

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

6 / 60

What does it mean when you calculate a 95% confidence interval?

a. You can be “5% confident” that your interval will not include the population parameter

b. The sample result is between this interval

c. You can be “95% confident” that your interval will include the population parameter

d. The process you used will capture the true parameter 95% of the time in the long run

7 / 60

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

a. 0

b. 2

c. 1

d. 3

8 / 60

Computers are essential for quantitative data analysis because?

a. they are so powerful

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

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

d. they are fun to use.

9 / 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. Standard Error or Estimate

c. Coefficient of Correlation

d. Coefficient of Skewness

10 / 60

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

a. Maximum

b. Less than 1

c. Minimum (Least)

d. Zero

11 / 60

If all the actual and estimated values of Y are same on the regression line, the sum of squares of error will be:

a. Zero

b. Maximum

c. Minimum

d. Unknown

12 / 60

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

a. Strong

b. Zero

c. Positive

d. Negative

13 / 60

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

a. Independent

b. Qualitative

c. Correlation

d. Dependent

14 / 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

15 / 60

The null hypothesis states the means are:

a. Equal

b. Research hypothesis

c. Not equal

d. Alternative hypothesis

16 / 60

Bivariate Data are the data collected for :

a. Two variables at the same point of time

b. More than two variables

c. Two variables

d. Two variables at different points of time.

17 / 60

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

a. Negative

b. Constant

c. Positive

d. Zero

18 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Negative

b. Different

c. Same

d. Positive

19 / 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

20 / 60

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

a. Independent variable

b. Y-intercept

c. X-intercept

d. Dependent variable

21 / 60

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

a. Negative

b. Positive

c. Undecided

d. Zero

22 / 60

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

a. Pie diagram

b. Historigram

c. Scatter diagram

d. Histogram

23 / 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

24 / 60

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

a. a = b

b. b = 1

c. b = 0

d. b ≠ 0

25 / 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. Zero

b. Perfect negative

c. Perfect positive

d. Negative

26 / 60

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

a. response, or dependent, variable

b. is usually x

c. independent variable

d. intervening variable

27 / 60

The coefficient of correlation

a. can never be positive

b. can never be negative

c. is the coefficient of determination squared

d. is the square root of the coefficient of determination

28 / 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

b. +1

c. 0.5

d. -1

29 / 60

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

a. Intercept

b. Difficult to tell

c. Sum of residual

d. Slope

30 / 60

Inferential statistics enable you to (Except one):

a. decide if the null hypothesis is false

b. estimate population parameters.

c. decide if your research results are meaningful.

d. decide if the research hypothesis is true

31 / 60

All data points falling along a straight line is called:

a. Scatter diagram

b. Residual

c. Linear relationship

d. Non linear relationship

32 / 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.

33 / 60

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

a. must also be equal to 1

b. must be -1

c. can be either -1 or +1

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

34 / 60

A scatter plot?

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

b. Shows a continuous relationship between two variables over time

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

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

35 / 60

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

a. y intercept

b. parameter

c. independent variable

d. slope of the line

36 / 60

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

a. 17

b. 4

c. 21

d. 13

37 / 60

In regression analysis, the variable that is being predicted is

a. the independent variable

b. usually denoted by x

c. slope

d. the dependent variable

38 / 60

Inferential statistics enable you to :

a. decide conducting interview

b. decide analysis data

c. estimate population parameters.

d. decide conducting research

39 / 60

Which of the following are examples of continuous variables?

a. Distance between

b. Number of children

c. Birth weight of babies

d. Age in year

40 / 60

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

a. Negative

b. Positive

c. Zero

d. Weak

41 / 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. 22

b. 19

c. 21

d. 20

42 / 60

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

a. -0.2

b. 2

c. 0.2X

d. -2

43 / 60

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

a. Method

b. Discussion

c. Introduction

d. Result

44 / 60

The purpose of simple linear regression analysis is to:

a. Measure the degree to which two variables are linearly associated

b. Replace points on a scatter diagram by a straight-line

c. Obtain the expected value of the independent variable

d. Predict one variable from another variable

45 / 60

Which of the following statements is false?

a. The coefficient of determination can be applied to any straight line.

b. The coefficient of determination is the variation in y explained by variation in x, divided by the total variation in y.

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

d. The coefficient of determination can be applied to any curve.

46 / 60

The regression equation always passes through:

a. Mean X

b. (X, Y)

c. (a, b)

d. mean X, Mean Y

47 / 60

The coefficient of determination, r2, indicates:

a. The linear relationship between two variables

b. The sum of the residuals from each data point

c. How closely the data fit a defined curve

d. The slope of the line of best fit

48 / 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. the findings can be generalized to other social phenomena

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

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

49 / 60

A perfect positive correlation is signified by:

a. 0

b. -1 to +1

c. +1

d. -1

50 / 60

A qualitative variable:

a. Has many outcomes

b. Always refers to a sample

c. Has only two possible outcomes

d. Is not numeric

51 / 60

In descriptive statistics our main objective is to:

a. Infer something about the population

b. Describe the data we collected

c. Draw conclusion

d. Describe the population

52 / 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

53 / 60

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

a. Perfect positive correlation

b. Negative correlation

c. Perfect negative correlation

d. Positive correlation

54 / 60

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

a. Data retrieval

b. Data promotion

c. Data analysis and interpretation

d. Data presentation

55 / 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. 0.64%

b. 0.80%

c. 64%

d. 80%

56 / 60

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

a. -1 to +1

b. 1 to infinity

c. 0 to +1

d. -1 to 0

57 / 60

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

a. R2

b. The f-value

c. The t-value

d. The p-value

58 / 60

Relationship between correlation coefficient and coefficient of determination is that?

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

b. both are equal

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

d. both are unrelated

59 / 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

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

60 / 60

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

a. Slope

b. Intercept

c. Regression equation

d. Error

Your score is

The average score is 86%

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Statistique Et Méthodologie De La Recherche Test

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