Statistique Et Méthodologie De La Recherche Test

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1 / 60

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

a. Opposite direction

b. Downward direction

c. Same direction

d. Upward direction

2 / 60

Which of the following statements is true regarding a sample?

a. It refers to estimation

b. It is a part of population

c. It must contain at least five observations

d. It refers to descriptive statistics

3 / 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

4 / 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

5 / 60

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

a. y intercept

b. independent variable

c. slope of the line

d. parameter

6 / 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

7 / 60

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

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

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

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

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

8 / 60

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

a. Probability

b. Significance

c. Unbiased

d. Descriptive

9 / 60

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

a. The sample result is between this interval

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

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

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

10 / 60

In regression, the equation that describes how the response variable (y) is related to the
explanatory variable (x) is:

a. used to compute the correlation coefficient

b. the regression model

c. the correlation model

d. the sample size

11 / 60

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

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

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

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

12 / 60

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

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

b. Under the line

c. On a straight line

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

13 / 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 larger than 0

d. b ≠ 0

14 / 60

The two forms of t-test are:

a. Bivariate and multiple

b. Independent and dependent

c. One-way and two-way

d. Factorial and interaction

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 correlation coefficient is used to determine:

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

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

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

d. The estimation parameter

17 / 60

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

a. Correlation coefficient

b. Regression equation

c. Slope

d. Intercept

18 / 60

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

a. 2

b. 1

c. 3

d. 0

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. Word, Excel

b. Access

c. Stata

d. Excel

20 / 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 negative correlation

b. Perfect positive correlation

c. Negative correlation

d. Positive correlation

21 / 60

Which of the following requirements for a scientific report writing may depend on your
institution (EXCEPT ONE)?

a. The size of the study

b. Whether an abstract should be included

c. The format for referencing

d. Oral presentation

22 / 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. Measure model fit

c. Estimate correlation

d. To determine how well the model works

23 / 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. Coefficient of Determination

c. Standard error of estimate

d. Sample size

24 / 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. must be in some unit of weight

d. can be any units

25 / 60

The coefficient of determination is the?

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

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

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

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

26 / 60

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

a. Data presentation

b. Data promotion

c. Data analysis and interpretation

d. Data retrieval

27 / 60

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

a. slope of the line

b. parameter

c. y intercept

d. independent variable

28 / 60

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

a. R2

b. The f-value

c. The p-value

d. The t-value

29 / 60

A scatterplot is a ?

a. one-dimensional graph of randomly scattered data.

b. two-dimensional graph of a curved line.

c. two-dimensional graph of a straight line.

d. two-dimensional graph of data values.

30 / 60

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

a. the mean of the means.

b. the standard error.

c. the central limit.

d. the expected value

31 / 60

The coefficient of correlation

a. is the coefficient of determination squared

b. can never be negative

c. can never be positive

d. is the square root of the coefficient of determination

32 / 60

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

a. Fail to reject the null hypothesis

b. Strong evidence to reject the null hypothesis

c. Reject the null hypothesis

d. Statistically significant

33 / 60

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

a. Focus group

b. Randomized clinical trial

c. Cross-sectional study

d. Case report

34 / 60

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

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

b. measure the difference between two variables.

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

d. assess whether two variables measure the same phenomenon.

35 / 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. Positive

d. Zero

36 / 60

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

a. Two

b. Three

c. One

d. Four

37 / 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

38 / 60

In regression analysis, the variable that is being predicted is

a. usually denoted by x

b. the independent variable

c. slope

d. the dependent variable

39 / 60

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

a. Weak

b. Positive

c. Negative

d. Zero

40 / 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. 64%

b. 0.80%

c. 80%

d. 0.64%

41 / 60

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

a. Negative

b. Zero

c. Positive

d. Undecided

42 / 60

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

a. as x decrease y increases

b. as x increases y decreases

c. as x increases y increases

d. as x decrease y decreases

43 / 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

44 / 60

A qualitative variable:

a. Always refers to a sample

b. Has only two possible outcomes

c. Has many outcomes

d. Is not numeric

45 / 60

Correlation analysis aims at :

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

b. Establishing relation between two variables

c. Measuring the extent of relation between two variables

d. Investigate cause of outcome

46 / 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. Zero

b. Perfect positive

c. Negative

d. Perfect negative

47 / 60

All data points falling along a straight line is called:

a. Scatter diagram

b. Non linear relationship

c. Linear relationship

d. Residual

48 / 60

In correlation both variables are always?

a. Non Random

b. Random

c. same

d. different

49 / 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 thinking.

c. statistical analysis.

d. Simple random sampling

50 / 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

51 / 60

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

a. Data mapping

b. Data analysis

c. Data mining

d. Data trending

52 / 60

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

a. Same direction

b. Difficult to tell

c. Opposite direction

d. Same and opposite direction

53 / 60

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

a. 10%

b. 70%

c. 30%

d. 9%

54 / 60

The regression equation always passes through:

a. (X, Y)

b. mean X, Mean Y

c. Mean X

d. (a, b)

55 / 60

A scatter plot?

a. Is used to compare parts to the whole or to compare the total with each part or percentage

b. Shows a (negative or positive) relationship or correlation between 2 variables and how they interact

c. Shows a continuous relationship between two variables over time

d. Is useful in comparing differences in magnitude of different variables

56 / 60

In descriptive statistics our main objective is to:

a. Describe the population

b. Infer something about the population

c. Draw conclusion

d. Describe the data we collected

57 / 60

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

a. Result

b. Method

c. Introduction

d. Discussion

58 / 60

The percent of total variation of the dependent variable Y explained by the set of independent variables X is measured by

a. Coefficient of Skewness

b. Standard Error or Estimate

c. Coefficient of Correlation

d. Coefficient of Determination

59 / 60

The purpose of simple linear regression analysis is to:

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

b. Obtain the expected value of the independent variable

c. Predict one variable from another variable

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

60 / 60

When regression line passes through the origin, then:

a. Association is zero

b. Regression coefficient is zero

c. Correlation is zero

d. Intercept is zero

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Statistique Et Méthodologie De La Recherche Test

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