Statistique Et Méthodologie De La Recherche Test

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1 / 60

The coefficient of determination is the?

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

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

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

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

2 / 60

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

a. Estimates

b. Parameters

c. Random errors

d. Variables

3 / 60

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

a. slope of the line

b. parameter

c. independent variable

d. y intercept

4 / 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. Minimum

b. Zero

c. Maximum

d. Unknown

5 / 60

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

a. Data presentation

b. Data promotion

c. Data retrieval

d. Data analysis and interpretation

6 / 60

A t-test is used to compare:

a. 4 means

b. 3 means

c. 5 means

d. 2 means

7 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Positive

b. Same

c. Different

d. Negative

8 / 60

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

a. parameter

b. slope of the line

c. independent variable

d. y intercept

9 / 60

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

a. 0 to +1

b. -1 to +1

c. -1 to 0

d. 1 to infinity

10 / 60

Computers are essential for quantitative data analysis because?

a. they are fun to use.

b. they are so powerful

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

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

11 / 60

The term regression was used by:

a. Galton

b. Spearman

c. Newton

d. Pearson

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

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

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

13 / 60

Correlation and regression are concerned with ?

a. the relationship between two quantitative variables.

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

c. the relationship between two categorical variables.

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

14 / 60

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

a. Statistically significant

b. Reject the null hypothesis

c. Strong evidence to reject the null hypothesis

d. Fail to reject the null hypothesis

15 / 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

16 / 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. 80%

c. 64%

d. 0.80%

17 / 60

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

a. Four

b. One

c. Two

d. Three

18 / 60

Correlation analysis aims at :

a. Establishing relation between two variables

b. Investigate cause of outcome

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

d. Measuring the extent of relation between two variables

19 / 60

In the regression equation Y = a + bX, where a and b are called:

a. Estimates

b. Constants

c. Intercept and slope

d. Parameters

20 / 60

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

a. Correlation coefficient of X on Y

b. Correlation coefficient of Y on X

c. Regression coefficient of Y on X

d. Regression coefficient of X on Y

21 / 60

The coefficient of determination (r2) is

a. usually less than zero

b. 100%

c. the square root of the correlation coefficient

d. the correlation coefficient squared

22 / 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. 20

b. 22

c. 21

d. 19

23 / 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. Minimum

c. Zero

d. Maximum

24 / 60

A discrete variable is:

a. Can assume only certain clearly separated values

b. Can have two values

c. An example of a qualitative variable

d. Can assume only whole number values

25 / 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.

26 / 60

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

a. Minimum (Least)

b. Maximum

c. Zero

d. Less than 1

27 / 60

Relationship between correlation coefficient and coefficient of determination is that?

a. both are equal

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

c. both are unrelated

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

28 / 60

A coefficient of correlation is computed to be -0.95 means that

a. The relationship between two variables is strong and positive

b. The relationship between two variables is weak.

c. The relationship between two variables is strong and but negative

d. Correlation coefficient cannot have this value

29 / 60

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

a. can be either -1 or +1

b. must be -1

c. must also be equal to 1

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

30 / 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

31 / 60

If there is a very strong correlation between two variables then the correlation coefficient must
be:

a. much larger than 0, regardless of whether the correlation is negative or positive

b. less than zero

c. much smaller than 0, if the correlation is negative

d. any value larger than 1

32 / 60

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

a. Scatter diagram

b. Pie diagram

c. Histogram

d. Historigram

33 / 60

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

a. Data analysis

b. Data trending

c. Data mining

d. Data mapping

34 / 60

R2 is used in regression analysis to:

a. Estimate correlation

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. Measure model fit

35 / 60

When the two regression lines are parallel to each other, then their slopes are:

a. Positive

b. Zero

c. Same

d. Different

36 / 60

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

a. Estimate

b. Dependent variable

c. Continuous variable

d. Independent variable

37 / 60

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

a. Intercept

b. Regression equation

c. Slope

d. Error

38 / 60

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

a. 0 ≤ r ≤ 1

b. -1 ≤ r

c. -1 ≤ r ≤ 1

d. r ≥ 1

39 / 60

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

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

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

c. The sample result is between this interval

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

40 / 60

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

a. is 0.6561

b. must be negative

c. must be positive

d. could be either + 0.9 or – 0.9

41 / 60

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

a. Negative

b. Positive

c. Zero

d. Weak

42 / 60

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

a. Negative

b. Zero

c. Positive

d. Strong

43 / 60

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

a. Zero

b. Positive

c. Negative

d. One

44 / 60

Internal “validity” refers to:

a. how accurately the measurements represent underlying concepts.

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

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

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

45 / 60

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

a. the expected value

b. the central limit.

c. the mean of the means.

d. the standard error.

46 / 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.

47 / 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

48 / 60

Bivariate Data are the data collected for :

a. Two variables

b. Two variables at different points of time.

c. Two variables at the same point of time

d. More than two variables

49 / 60

The most commonly used formula to describe linear relationship is?

a. ŷ = b0 + b1x

b. ŷ = b0 + b1x+b2

c. ŷ = b0 + b1x + b2x2

d. ŷ = b0 + b1x2

50 / 60

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

a. Inferential statistics

b. Descriptive statistics

c. Correlated statistics

d. Regression statistics

51 / 60

Which of the following are examples of continuous variables?

a. Age in year

b. Number of children

c. Birth weight of babies

d. Distance between

52 / 60

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

a. Dependent

b. Independent

c. Qualitative

d. Correlation

53 / 60

The purpose of simple linear regression analysis is to:

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

b. Obtain the expected value of the independent variable

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

d. Predict one variable from another variable

54 / 60

If the value of regression coefficient is zero, then the two variable are called:

a. Dependent

b. Independent

c. Independent and dependent

d. Difficult to tell

55 / 60

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

a. intervening variable

b. response, or dependent, variable

c. independent variable

d. is usually x

56 / 60

When regression line passes through the origin, then:

a. Intercept is zero

b. Association is zero

c. Regression coefficient is zero

d. Correlation is zero

57 / 60

The dependent variable is also called except one:

a. Independent variable

b. Predictand variable

c. Regressand variable

d. Explained variable

58 / 60

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

a. Nonlinear relationship

b. Linear negative

c. Linear positive

d. Linear relationship

59 / 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. ANOVA

b. Chi-square

c. The dependent samples t-test

d. ANCOVA

60 / 60

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

a. 1.00

b. 0.25

c. 2.50

d. 0.10

Your score is

The average score is 15%

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Statistique Et Méthodologie De La Recherche Test

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