Statistique Et Méthodologie De La Recherche Test

0 votes, 0 avg

You will have 60 minutes to complete all the questions. After the timer reaches 60 minutes, the exam will end and be saved automatically. Good luck! *Fingers crossed*

The timer has been reached. The exam has now been terminated and saved.

1 / 60

A scatterplot is a ?

a. one-dimensional graph of randomly scattered data.

b. two-dimensional graph of data values.

c. two-dimensional graph of a straight line.

d. two-dimensional graph of a curved line.

2 / 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 Correlation

b. Standard error of estimate

c. Coefficient of Determination

d. Sample size

3 / 60

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

a. y intercept

b. parameter

c. independent variable

d. slope of the line

4 / 60

Scatter diagram helps us to :

a. Compute the extent of correlation between two variables

b. Obtain the mathematical relationship between two variables

c. Calculate slop

d. Find the nature correlation between two variables

5 / 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

6 / 60

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

a. The relationship between two variables is weak.

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

c. Correlation coefficient cannot have this value

d. The relationship between two variables is strong and positive

7 / 60

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

a. No statistically significant

b. No evidence to reject the null hypothesis

c. Fail to reject the null hypothesis

d. Reject the null hypothesis

8 / 60

In regression analysis, the variable that is being predicted is

a. slope

b. usually denoted by x

c. the dependent variable

d. the independent variable

9 / 60

Relationship between correlation coefficient and coefficient of determination is that?

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

b. both are equal

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

d. both are unrelated

10 / 60

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

a. The p-value

b. R2

c. The f-value

d. The t-value

11 / 60

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

a. Difficult to tell

b. Same direction

c. Opposite direction

d. Same and opposite direction

12 / 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

13 / 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

14 / 60

The regression equation always passes through:

a. (X, Y)

b. Mean X

c. (a, b)

d. mean X, Mean Y

15 / 60

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

a. b = 1

b. b ≠ 0

c. a = b

d. b = 0

16 / 60

Which of the following statements is true regarding a sample?

a. It is a part of population

b. It refers to descriptive statistics

c. It refers to estimation

d. It must contain at least five observations

17 / 60

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

a. Random errors

b. Estimates

c. Parameters

d. Variables

18 / 60

In correlation both variables are always?

a. Non Random

b. Random

c. different

d. same

19 / 60

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

a. Y-intercept

b. X-intercept

c. Dependent variable

d. Independent variable

20 / 60

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

a. slope of the regression

b. standard error

c. coefficient of determination

d. mean square error

21 / 60

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

a. Downward direction

b. Same direction

c. Opposite direction

d. Upward direction

22 / 60

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

a. Linear relationship

b. Linear negative

c. Nonlinear relationship

d. Linear positive

23 / 60

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

a. 0.25

b. 2.50

c. 0.10

d. 1.00

24 / 60

The coefficient of determination, r2, indicates:

a. The slope of the line of best fit

b. How closely the data fit a defined curve

c. The sum of the residuals from each data point

d. The linear relationship between two variables

25 / 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. Positive correlation

d. Perfect negative correlation

26 / 60

Quantitative data refers to:

a. statistical analysis

b. graphs and tables.

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

d. any data you present in your report

27 / 60

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

a. 3

b. 0

c. 1

d. 2

28 / 60

The coefficient of determination (r2) is

a. usually less than zero

b. 100%

c. the correlation coefficient squared

d. the square root of the correlation coefficient

29 / 60

The coefficient of correlation

a. is the square root of the coefficient of determination

b. can never be positive

c. can never be negative

d. is the coefficient of determination squared

30 / 60

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

a. Strong

b. Perfect negative

c. Perfect correlation

d. Weak

31 / 60

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

a. Inference

b. Partial correlation analysis

c. Correlation analysis

d. Regression analysis

32 / 60

Internal “validity” refers to:

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

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

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

d. how accurately the measurements represent underlying concepts.

33 / 60

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

a. Zero

b. Negative

c. Constant

d. Positive

34 / 60

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

a. must be -1

b. must also be equal to 1

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

d. can be either -1 or +1

35 / 60

Because of the possibility of error in sampling from populations, researchers use:

a. Unbiased

b. Significance

c. Descriptive

d. Probability

36 / 60

Inferential statistics enable you to (Except one):

a. decide if your research results are meaningful.

b. estimate population parameters.

c. decide if the null hypothesis is false

d. decide if the research hypothesis is true

37 / 60

To investigate the association between two categorical variables we use:

a. Chi-squared test

b. z-test

c. F-test

d. t-test

38 / 60

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

a. Negative

b. Zero

c. One

d. Positive

39 / 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. 20

c. 19

d. 22

40 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Different

b. Negative

c. Positive

d. Same

41 / 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

42 / 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

43 / 60

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

a.  -0-.5 and +0.5

b. -1 and +1

c. -1 and 0

d. 0 and 1

44 / 60

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

a. Correlation coefficient of Y on X

b. Regression coefficient of X on Y

c. Correlation coefficient of X on Y

d. Regression coefficient of Y on X

45 / 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. The relationship between two variables is negative

b. The correlation coefficient is 0.39 also

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

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

46 / 60

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

a. any value larger than 1

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

c. less than zero

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

47 / 60

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

a. can not be zero

b. must also be positive

c. can be zero

d. can be either negative or positive

48 / 60

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

a. independent variable

b. response, or dependent, variable

c. is usually x

d. intervening variable

49 / 60

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

a. Two

b. Four

c. One

d. Three

50 / 60

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

a. Negative number

b. 0

c. +1

d. -1

51 / 60

The arithmetic mean of the two regression coefficients is greater than or equal to:

a. -1

b. r

c. 0

d. +1

52 / 60

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

a. Positive

b. Weak

c. Zero

d. Negative

53 / 60

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

a. Strong evidence to reject the null hypothesis

b. Reject the null hypothesis

c. Fail to reject the null hypothesis

d. Statistically significant

54 / 60

The null hypothesis states the means are:

a. Not equal

b. Research hypothesis

c. Alternative hypothesis

d. Equal

55 / 60

To compare three independent means we use:

a. F-test

b. Chi-squared test

c. Oneway ANOVA

d. t-test

56 / 60

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

a. 70%

b. 30%

c. 10%

d. 9%

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

58 / 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 a quantitative explanatory variable and a categorical response variable.

d. the relationship between two categorical variables.

59 / 60

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

a. Estimating a parameter

b. Estimating a statistic.

c. test a hypothesis

d. analyze relationships

60 / 60

Which of the following statements is true?

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

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

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

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

Your score is

The average score is 0%

Any comments?

Statistique Et Méthodologie De La Recherche Test

Any problems/errors or mistakes found while testing, please let us know for modification!

និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត