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

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

a. Regression coefficient of X on Y

b. Correlation coefficient of X on Y

c. Regression coefficient of Y on X

d. Correlation coefficient of Y on X

2 / 60

A qualitative variable:

a. Is not numeric

b. Has only two possible outcomes

c. Always refers to a sample

d. Has many outcomes

3 / 60

The two forms of t-test are:

a. Bivariate and multiple

b. One-way and two-way

c. Independent and dependent

d. Factorial and interaction

4 / 60

Inferential statistics enable you to (Except one):

a. decide if your research results are meaningful.

b. decide if the null hypothesis is false

c. estimate population parameters.

d. decide if the research hypothesis is true

5 / 60

To investigate the association between two categorical variables we use:

a. t-test

b. Chi-squared test

c. F-test

d. z-test

6 / 60

Correlation and regression are concerned with ?

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

b. the relationship between two categorical variables.

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

d. the relationship between two quantitative variables.

7 / 60

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

a. Difficult to tell

b. Sum of residual

c. Intercept

d. Slope

8 / 60

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

a. Result

b. Introduction

c. Method

d. Discussion

9 / 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.

10 / 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

11 / 60

The regression equation always passes through:

a. (a, b)

b. Mean X

c. mean X, Mean Y

d. (X, Y)

12 / 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

13 / 60

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

a. 0

b. 1

c. 3

d. 2

14 / 60

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

a. -1

b. 0

c. r

d. +1

15 / 60

A discrete variable is:

a. Can assume only certain clearly separated values

b. Can assume only whole number values

c. Can have two values

d. An example of a qualitative variable

16 / 60

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

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

b. Correlation coefficient cannot have this value

c. The relationship between two variables is weak.

d. The relationship between two variables is strong and positive

17 / 60

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

a. Pie diagram

b. Historigram

c. Scatter diagram

d. Histogram

18 / 60

An example of an experimental study is a(n):

a. Focus group

b. Cross-sectional study

c. Randomized clinical trial

d. Case report

19 / 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. Access

b. Word, Excel

c. Stata

d. Excel

20 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Different

b. Positive

c. Negative

d. Same

21 / 60

If two variables, x and y, have a very strong linear relationship, then:

a. there is evidence that x causes a change in y

b. there is evidence that y causes a change in x

c. There is large correlation coefficient

d. there might not be any causal relationship between x and y

22 / 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 lower left to upper right

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

d. On a straight line

23 / 60

All data points falling along a straight line is called:

a. Linear relationship

b. Non linear relationship

c. Scatter diagram

d. Residual

24 / 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. 10%

c. 9%

d. 30%

25 / 60

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

a. Slope and Regression coefficient

b. Intercept

c. Regression coefficient

d. Slope

26 / 60

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

a. Data retrieval

b. Data analysis and interpretation

c. Data presentation

d. Data promotion

27 / 60

Quantitative data refers to:

a. graphs and tables.

b. statistical analysis

c. any data you present in your report

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

28 / 60

In correlation both variables are always?

a. different

b. same

c. Random

d. Non Random

29 / 60

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

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

b. any value larger than 1

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

d. less than zero

30 / 60

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

a. slope of the line

b. parameter

c. independent variable

d. y intercept

31 / 60

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

a. The t-value

b. The p-value

c. The f-value

d. R2

32 / 60

Which of the following statements is false?

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

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

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

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

33 / 60

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

a. Reject the null hypothesis

b. Fail to reject the null hypothesis

c. Statistically significant

d. Strong evidence to reject the null hypothesis

34 / 60

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

a. Nonlinear correlation

b. Negative correlation

c. Positive correlation

d. Linear correlation

35 / 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. can be any value between -1 to +1

d. must also be equal to 1

36 / 60

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

a. Same

b. Zero

c. Positive

d. Different

37 / 60

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

a. Negative

b. Zero

c. Undecided

d. Positive

38 / 60

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

a. Regression enables prediction of the dependent variable

b. Correlation is the same as regression

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

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

39 / 60

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

a. -1 and +1

b. 0 and 1

c. -1 and 0

d.  -0-.5 and +0.5

40 / 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

41 / 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 whether two variables measure the same phenomenon.

c. measure the difference between two variables.

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

42 / 60

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

a. -1

b. 0

c. Negative number

d. +1

43 / 60

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

a. Dependent variable

b. Independent variable

c. Y-intercept

d. X-intercept

44 / 60

The coefficient of determination, r2, indicates:

a. The sum of the residuals from each data point

b. The linear relationship between two variables

c. How closely the data fit a defined curve

d. The slope of the line of best fit

45 / 60

The most commonly used formula to describe linear relationship is?

a. ŷ = b0 + b1x2

b. ŷ = b0 + b1x+b2

c. ŷ = b0 + b1x

d. ŷ = b0 + b1x + b2x2

46 / 60

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

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

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

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

d. the findings can be generalized to other social phenomena

47 / 60

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

a. is 0.6561

b. could be either + 0.9 or – 0.9

c. must be negative

d. must be positive

48 / 60

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

a. can be zero

b. can not be zero

c. must also be positive

d. can be either negative or positive

49 / 60

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

a. Opposite direction

b. Upward direction

c. Same direction

d. Downward direction

50 / 60

A t-test is used to compare:

a. 2 means

b. 5 means

c. 3 means

d. 4 means

51 / 60

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

a. Dependent variable

b. Independent variable

c. Continuous variable

d. Estimate

52 / 60

A perfect positive correlation is signified by:

a. -1

b. -1 to +1

c. 0

d. +1

53 / 60

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

a. -0.2

b. -2

c. 2

d. 0.2X

54 / 60

A scatterplot is a ?

a. two-dimensional graph of data values.

b. two-dimensional graph of a curved line.

c. two-dimensional graph of a straight line.

d. one-dimensional graph of randomly scattered data.

55 / 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

56 / 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. descriptive statistics.

b. statistical analysis.

c. Simple random sampling

d. statistical thinking.

57 / 60

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

a. Opposite direction

b. Same and opposite direction

c. Difficult to tell

d. Same direction

58 / 60

The term regression was used by:

a. Spearman

b. Newton

c. Galton

d. Pearson

59 / 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. Maximum

d. Zero

60 / 60

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

a. Regression statistics

b. Inferential statistics

c. Correlated statistics

d. Descriptive statistics

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