Statistique Et Méthodologie De La Recherche Test

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1 / 60

To compare three independent means we use:

a. Chi-squared test

b. Oneway ANOVA

c. F-test

d. t-test

2 / 60

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

a. Weak

b. Perfect correlation

c. Perfect negative

d. Strong

3 / 60

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

a. Descriptive statistics

b. Regression statistics

c. Correlated statistics

d. Inferential statistics

4 / 60

The correlation coefficient is used to determine:

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

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

c. The estimation parameter

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

5 / 60

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

a. No evidence to reject the null hypothesis

b. No statistically significant

c. Fail to reject the null hypothesis

d. Reject the null hypothesis

6 / 60

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

a. Data presentation

b. Data retrieval

c. Data analysis and interpretation

d. Data promotion

7 / 60

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

a. the findings can be generalized to other social phenomena

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

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

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

8 / 60

Bivariate Data are the data collected for :

a. Two variables at the same point of time

b. Two variables at different points of time.

c. Two variables

d. More than two variables

9 / 60

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

a. must be negative

b. could be either + 0.9 or – 0.9

c. is 0.6561

d. must be positive

10 / 60

To investigate the association between two categorical variables we use:

a. F-test

b. z-test

c. Chi-squared test

d. t-test

11 / 60

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

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

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

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

d. There is large correlation coefficient

12 / 60

The signs of regression coefficients and correlation coefficient are always:

a. Different

b. Positive

c. Same

d. Negative

13 / 60

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

a. Zero

b. Positive

c. Negative

d. Constant

14 / 60

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

a. Same

b. Positive

c. Different

d. Zero

15 / 60

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

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

b. The sample result is between this interval

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

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

16 / 60

When regression line passes through the origin, then:

a. Correlation is zero

b. Intercept is zero

c. Association is zero

d. Regression coefficient is zero

17 / 60

Computers are essential for quantitative data analysis because?

a. they are so powerful

b. they are fun to use.

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

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

18 / 60

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

a. the expected value

b. the mean of the means.

c. the standard error.

d. the central limit.

19 / 60

Scatter diagram helps us to :

a. Calculate slop

b. Obtain the mathematical relationship between two variables

c. Find the nature correlation between two variables

d. Compute the extent of correlation between two variables

20 / 60

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

a. cannot be in kilograms

b. must be in some unit of weight

c. can be any units

d. must also be in kilograms

21 / 60

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

a. 0.2X

b. -0.2

c. 2

d. -2

22 / 60

Correlation and regression are concerned with ?

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

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

c. the relationship between two categorical variables.

d. the relationship between two quantitative variables.

23 / 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. r = -1

c. r ≥ 0

d. 0 ≤ r ≤ 1

24 / 60

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

a. -1 ≤ r ≤ 1

b. -1 ≤ r

c. r ≥ 1

d. 0 ≤ r ≤ 1

25 / 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 respondent did not know the answer or did not have an opinion

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

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

26 / 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

27 / 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. statistical thinking.

b. statistical analysis.

c. Simple random sampling

d. descriptive statistics.

28 / 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

29 / 60

Scatter diagram is considered for measuring :

a. Predict independent variable

b. Linear relationship between two variables

c. Predict dependent variable

d. Curvilinear relationship between two variables

30 / 60

The straight line graph of the linear equation Y = a + bX, slope will be downward If:

a. b smaller than 0

b. b larger than 0

c. b = 0

d. b ≠ 0

31 / 60

The two forms of t-test are:

a. Independent and dependent

b. Factorial and interaction

c. One-way and two-way

d. Bivariate and multiple

32 / 60

An r value of 0.80 indicates:

a. Correlation but not linear

b. Perfect linear correlation

c. Strong linear correlation

d. No linear correlation

33 / 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 decrease y decreases

d. as x increases y increases

34 / 60

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

a. Variables

b. Estimates

c. Random errors

d. Parameters

35 / 60

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

a. Intercept

b. Slope

c. Regression coefficient

d. Slope and Regression coefficient

36 / 60

A perfect positive correlation is signified by:

a. 0

b. -1 to +1

c. +1

d. -1

37 / 60

Inferential statistics enable you to :

a. decide conducting interview

b. decide analysis data

c. estimate population parameters.

d. decide conducting research

38 / 60

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

a. Descriptive

b. Probability

c. Significance

d. Unbiased

39 / 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. Coefficient of Determination

c. Coefficient of Correlation

d. Standard Error or Estimate

40 / 60

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

a. 13

b. 4

c. 21

d. 17

41 / 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 negative

c. Negative

d. Perfect positive

42 / 60

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

a. Intercept

b. Sum of residual

c. Slope

d. Difficult to tell

43 / 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. ANCOVA

b. ANOVA

c. Chi-square

d. The dependent samples t-test

44 / 60

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

a. Regression enables prediction of the dependent variable

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

c. Correlation is the same as regression

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

45 / 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%

46 / 60

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

a. Four

b. Two

c. Three

d. One

47 / 60

Inferential statistics enable you to :

a. decide collecting data

b. estimate sample size

c. decide if the research hypothesis is true

d. calculate sample size.

48 / 60

A discrete variable is:

a. Can assume only whole number values

b. An example of a qualitative variable

c. Can assume only certain clearly separated values

d. Can have two values

49 / 60

The coefficient of determination is the?

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

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

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

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

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

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

d. We usually need to take several samples to obtain a good estimate of the population values.

51 / 60

Correlation analysis aims at :

a. Measuring the extent of relation between two variables

b. Establishing relation between two variables

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

d. Investigate cause of outcome

52 / 60

Quantitative data refers to:

a. statistical analysis

b. graphs and tables.

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

53 / 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. must be -1

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

54 / 60

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

a. Linear regression statistics

b. Part of experimental studies

c. Descriptive statistics

d. Inferential statistics

55 / 60

Two variables have a positive association when?

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

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

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

d. the values of both variables are always positive.

56 / 60

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

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

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

c. less than zero

d. any value larger than 1

57 / 60

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

a. -1

b. +1

c. r

d. 0

58 / 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. 39% of the total variation is explained by the independent variable

b. The correlation coefficient is 0.39 also

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

d. The relationship between two variables is negative

59 / 60

The range of regression coefficient is:

a. 0 to 1

b. 0 to ∞

c. -∞ to +∞

d. -1 to +1

60 / 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 weak relationship between the two variables

c. There is no relationship between the two variables

d. There is a strong relationship between the two variables

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Statistique Et Méthodologie De La Recherche Test

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