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

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

a. Upward direction

b. Same direction

c. Downward direction

d. Opposite direction

2 / 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%

3 / 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 correlation coefficient is 0.39 also

b. The relationship between two variables is negative

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

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

4 / 60

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

a. Positive

b. Weak

c. Negative

d. Zero

5 / 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

6 / 60

In descriptive statistics our main objective is to:

a. Describe the data we collected

b. Describe the population

c. Draw conclusion

d. Infer something about the population

7 / 60

The null hypothesis states the means are:

a. Alternative hypothesis

b. Research hypothesis

c. Not equal

d. Equal

8 / 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. Maximum

b. Positive

c. Minimum

d. Zero

9 / 60

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

a. 13

b. 4

c. 21

d. 17

10 / 60

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

a. r ≥ 1

b. -1 ≤ r

c. -1 ≤ r ≤ 1

d. 0 ≤ r ≤ 1

11 / 60

Inferential statistics enable you to :

a. decide if the research hypothesis is true

b. calculate sample size.

c. estimate sample size

d. decide collecting data

12 / 60

Bivariate Data are the data collected for :

a. Two variables

b. More than two variables

c. Two variables at different points of time.

d. Two variables at the same point of time

13 / 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

14 / 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. Unknown

c. Zero

d. Maximum

15 / 60

51. What is the slope of the line y = -3.4x – 2.5?

a. 2.5

b. -3.4

c. -2.5

d. 3.4

16 / 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. r = -1

b. 0 ≤ r ≤ 1

c. r = +1

d. r ≥ 0

17 / 60

A measure of the strength of the linear relationship that exists between two variables is called:

a. Correlation coefficient

b. Intercept

c. Regression equation

d. Slope

18 / 60

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

a. Qualitative

b. Independent

c. Correlation

d. Dependent

19 / 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. 0.5

b. 0

c. +1

d. -1

20 / 60

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

a. intervening variable

b. is usually x

c. response, or dependent, variable

d. independent variable

21 / 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 can be applied to any curve.

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

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

22 / 60

To compare three independent means we use:

a. Chi-squared test

b. t-test

c. Oneway ANOVA

d. F-test

23 / 60

The coefficient of determination (sometimes known as the regression coefficient) enables you to:

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

b. assess the strength of relationship between a quantifiable dependent variable and one or more quantifiable independent variables.

c. measure the difference between two variables.

d. assess whether two variables measure the same phenomenon.

24 / 60

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

a. Fail to reject the null hypothesis

b. No evidence to reject the null hypothesis

c. No statistically significant

d. Reject the null hypothesis

25 / 60

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

a. Undecided

b. Zero

c. Negative

d. Positive

26 / 60

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

a. Zero

b. Negative

c. Minimum

d. Positive

27 / 60

Quantitative data refers to:

a. graphs and tables.

b. any data you present in your report

c. statistical analysis

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

28 / 60

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

a. On a straight line

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

c. Under the line

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

29 / 60

The most commonly used formula to describe linear relationship is?

a. ŷ = b0 + b1x2

b. ŷ = b0 + b1x + b2x2

c. ŷ = b0 + b1x

d. ŷ = b0 + b1x+b2

30 / 60

Inferential statistics enable you to :

a. estimate population parameters.

b. decide analysis data

c. decide conducting research

d. decide conducting interview

31 / 60

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

a. Strong

b. Perfect correlation

c. Weak

d. Perfect negative

32 / 60

The range of regression coefficient is:

a. 0 to ∞

b. -∞ to +∞

c. 0 to 1

d. -1 to +1

33 / 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

34 / 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. Negative

b. Perfect negative

c. Perfect positive

d. Zero

35 / 60

An r value of 0.80 indicates:

a. Correlation but not linear

b. No linear correlation

c. Perfect linear correlation

d. Strong linear correlation

36 / 60

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

a. Error

b. Intercept

c. Regression equation

d. Slope

37 / 60

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

a. There is a relationship between the two variables

b. There is no relationship between the two variables

c. There is a weak relationship between the two variables

d. There is a strong relationship between the two variables

38 / 60

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

a. Slope and Regression coefficient

b. Intercept

c. Slope

d. Regression coefficient

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

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

d. The sample result is between this interval

40 / 60

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

a. 5

b. 1

c. 0

d. 0.5

41 / 60

If a study is “reliable”, this means that:

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

b. the methods are outlined in the methods discussion clearly enough for the research to be replicated.

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

d. the findings can be generalized to other social phenomena

42 / 60

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

a. Statistically significant

b. Strong evidence to reject the null hypothesis

c. Reject the null hypothesis

d. Fail to reject the null hypothesis

43 / 60

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

a. Variables

b. Random errors

c. Estimates

d. Parameters

44 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Same

b. Positive

c. Different

d. Negative

45 / 60

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

a. can be either -1 or +1

b. must also be equal to 1

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

d. must be -1

46 / 60

Which of the following statements regarding a researcher’s use of inferential statistics is
true?

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

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

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.

47 / 60

A scatterplot is a ?

a. two-dimensional graph of a straight line.

b. two-dimensional graph of a curved line.

c. one-dimensional graph of randomly scattered data.

d. two-dimensional graph of data values.

48 / 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

49 / 60

In correlation both variables are always?

a. different

b. Random

c. same

d. Non Random

50 / 60

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

a. Same direction

b. Same and opposite direction

c. Difficult to tell

d. Opposite direction

51 / 60

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

a. as x decrease y decreases

b. as x increases y increases

c. as x increases y decreases

d. as x decrease y increases

52 / 60

Which of the following are examples of continuous variables?

a. Distance between

b. Birth weight of babies

c. Age in year

d. Number of children

53 / 60

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

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

b. Correlation is the same as regression

c. Regression enables prediction of the dependent variable

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

54 / 60

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

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

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

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

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

55 / 60

Inferential statistics are useful for:

a. Observing natural behavior

b. Interviews

c. Construct validity

d. Determining the probability of something

56 / 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

57 / 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. can be any units

d. must be in some unit of weight

58 / 60

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

a. parameter

b. y intercept

c. independent variable

d. slope of the line

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 –1 to -2.

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

60 / 60

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

a. coefficient of determination

b. mean square error

c. standard error

d. slope of the regression

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