Statistique Et Méthodologie De La Recherche Test

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1 / 60

The dependent variable is also called except one:

a. Independent variable

b. Predictand variable

c. Explained variable

d. Regressand variable

2 / 60

Bivariate Data are the data collected for :

a. Two variables at different points of time.

b. Two variables at the same point of time

c. Two variables

d. More than two variables

3 / 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. much smaller than 0, if the correlation is negative

d. less than zero

4 / 60

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

a. must also be equal to 1

b. can be either -1 or +1

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

d. must be -1

5 / 60

In descriptive statistics our main objective is to:

a. Draw conclusion

b. Infer something about the population

c. Describe the population

d. Describe the data we collected

6 / 60

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

a. Opposite direction

b. Same direction

c. Difficult to tell

d. Same and opposite direction

7 / 60

R2 is used in regression analysis to:

a. Measure the amount of variance in the dependent variable explained by variation in the independent variables

b. To determine how well the model works

c. Measure model fit

d. Estimate correlation

8 / 60

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

a. Positive

b. Negative

c. Zero

d. Weak

9 / 60

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

a. -1

b. +1

c. 0

d. Negative number

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

11 / 60

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

a. as x increases y decreases

b. as x decrease y increases

c. as x increases y increases

d. as x decrease y decreases

12 / 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

13 / 60

The degree of linear association between two metric scaled variables is measured by:

a. β

b. significance level

c. analysis of variance

d. Pearson correlation coefficient

14 / 60

Correlation analysis is used to:

a. Predict values of y based on values of x

b. Simultaneously compare the effect of multiple independent variables on a dependent variable

c. Measure the strength of association between two variables

d. Analyse data

15 / 60

To compare three independent means we use:

a. F-test

b. t-test

c. Chi-squared test

d. Oneway ANOVA

16 / 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 X on Y

d. Regression coefficient of Y on X

17 / 60

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

a. Negative correlation

b. Nonlinear correlation

c. Positive correlation

d. Linear correlation

18 / 60

Two variables have a positive association when?

a. the values of one variable tend to increase irregard less of how the values of the other variable change.

b. the values of both variables are always positive.

c. the values of one variable tend to decrease as the values of the other variable increase.

d. the values of one variable tend to increase as the values of the other variable increase.

19 / 60

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

a. Strong

b. Positive

c. Zero

d. Negative

20 / 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. Stata

c. Excel

d. Word, Excel

21 / 60

In regression analysis, if the independent variable is measured in kilograms, the dependent
variable:

a. must be in some unit of weight

b. cannot be in kilograms

c. must also be in kilograms

d. can be any units

22 / 60

A qualitative variable:

a. Always refers to a sample

b. Has many outcomes

c. Has only two possible outcomes

d. Is not numeric

23 / 60

All data points falling along a straight line is called:

a. Linear relationship

b. Residual

c. Scatter diagram

d. Non linear relationship

24 / 60

The range of regression coefficient is:

a. -1 to +1

b. 0 to 1

c. 0 to ∞

d. -∞ to +∞

25 / 60

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

a. Data promotion

b. Data retrieval

c. Data presentation

d. Data analysis and interpretation

26 / 60

The purpose of simple linear regression analysis is to:

a. Obtain the expected value of the independent variable

b. Predict one variable from another variable

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

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

27 / 60

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

a. -1

b. r

c. +1

d. 0

28 / 60

Correlation analysis aims at :

a. Investigate cause of outcome

b. Establishing relation between two variables

c. Measuring the extent of relation between two variables

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

29 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Positive

b. Negative

c. Different

d. Same

30 / 60

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

a. Focus group

b. Cross-sectional study

c. Case report

d. Randomized clinical trial

31 / 60

In regression analysis, the variable that is doing the predicting or explaining is

a. usually denoted by y

b. the independent variable

c. the slope

d. the dependent variable

32 / 60

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

a. Histogram

b. Historigram

c. Pie diagram

d. Scatter diagram

33 / 60

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

a. Slope

b. Intercept

c. Difficult to tell

d. Sum of residual

34 / 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. Maximum

b. Minimum

c. Zero

d. Unknown

35 / 60

The two forms of t-test are:

a. Independent and dependent

b. Bivariate and multiple

c. Factorial and interaction

d. One-way and two-way

36 / 60

An r value of 0.80 indicates:

a. No linear correlation

b. Correlation but not linear

c. Strong linear correlation

d. Perfect linear correlation

37 / 60

The coefficient of determination is the?

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

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

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

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

38 / 60

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

a. Result

b. Introduction

c. Method

d. Discussion

39 / 60

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

a. On a straight line

b. Under the line

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

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

40 / 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. A specific value of the y-variable given a specific value of the x-variable

d. The strength of the relationship between the x and y variables

41 / 60

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

a. Minimum

b. Negative

c. Zero

d. Positive

42 / 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. Chi-square

b. The dependent samples t-test

c. ANCOVA

d. ANOVA

43 / 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

44 / 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

45 / 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

46 / 60

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

a. 1

b. 2

c. 0

d. 3

47 / 60

Scatter diagram helps us to :

a. Find the nature correlation between two variables

b. Obtain the mathematical relationship between two variables

c. Compute the extent of correlation between two variables

d. Calculate slop

48 / 60

The term regression was used by:

a. Pearson

b. Galton

c. Newton

d. Spearman

49 / 60

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

a. Estimates

b. Variables

c. Parameters

d. Random errors

50 / 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 positive

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

d. Correlation coefficient cannot have this value

51 / 60

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

a. 0

b. 0.5

c. 1

d. 5

52 / 60

To compare two means we use:

a. t-test

b. Oneway ANOVA

c. F-test

d. Chi-squared test

53 / 60

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

a. analyze relationships

b. Estimating a parameter

c. test a hypothesis

d. Estimating a statistic.

54 / 60

The mean, median, mode and standard deviation are examples of:

a. Descriptive statistics

b. Part of experimental studies

c. Inferential statistics

d. Linear regression statistics

55 / 60

Computers are essential for quantitative data analysis because?

a. they are fun to use.

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

c. they are so powerful

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

56 / 60

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

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

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

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

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

57 / 60

The null hypothesis states the means are:

a. Alternative hypothesis

b. Not equal

c. Research hypothesis

d. Equal

58 / 60

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

a. Zero

b. Constant

c. Positive

d. Negative

59 / 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 independent variable

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

60 / 60

Inferential statistics are useful for:

a. Construct validity

b. Determining the probability of something

c. Observing natural behavior

d. Interviews

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Statistique Et Méthodologie De La Recherche Test

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត