Statistique Et Méthodologie De La Recherche Test

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1 / 60

Inferential statistics enable you to :

a. calculate sample size.

b. estimate sample size

c. decide collecting data

d. decide if the research hypothesis is true

2 / 60

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

a. the expected value

b. the standard error.

c. the central limit.

d. the mean of the means.

3 / 60

Correlation analysis aims at :

a. Measuring the extent of relation between two variables

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

c. Investigate cause of outcome

d. Establishing relation between two variables

4 / 60

Two variables have a positive association when?

a. the values of both variables are always positive.

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

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

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

5 / 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

6 / 60

In regression analysis, the variable that is being predicted is

a. slope

b. usually denoted by x

c. the dependent variable

d. the independent variable

7 / 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. Simple random sampling

c. statistical analysis.

d. statistical thinking.

8 / 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 ≥ 0

d. r = -1

9 / 60

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

a. slope of the line

b. parameter

c. y intercept

d. independent variable

10 / 60

The null hypothesis states the means are:

a. Equal

b. Research hypothesis

c. Alternative hypothesis

d. Not equal

11 / 60

if the correlation coefficient r = 0.5 then the coefficient of determination is?

a. 1.00

b. 2.50

c. 0.10

d. 0.25

12 / 60

If the value of regression coefficient is zero, then the two variable are called:

a. Independent and dependent

b. Difficult to tell

c. Dependent

d. Independent

13 / 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

14 / 60

The dependent variable is also called except one:

a. Independent variable

b. Regressand variable

c. Predictand variable

d. Explained variable

15 / 60

A scatterplot is a ?

a. two-dimensional graph of a curved line.

b. two-dimensional graph of a straight line.

c. two-dimensional graph of data values.

d. one-dimensional graph of randomly scattered data.

16 / 60

Correlation analysis is used to:

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

b. Predict values of y based on values of x

c. Analyse data

d. Measure the strength of association between two variables

17 / 60

Inferential statistics enable you to :

a. decide conducting research

b. decide analysis data

c. estimate population parameters.

d. decide conducting interview

18 / 60

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

a. standard error

b. slope of the regression

c. mean square error

d. coefficient of determination

19 / 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

20 / 60

The null hypothesis states the means are:

a. Not equal

b. Research hypothesis

c. Equal

d. Alternative hypothesis

21 / 60

All data points falling along a straight line is called:

a. Non linear relationship

b. Residual

c. Scatter diagram

d. Linear relationship

22 / 60

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

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

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

c. It is best to measure every member of a population if possible

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

23 / 60

To compare two means we use:

a. Oneway ANOVA

b. Chi-squared test

c. t-test

d. F-test

24 / 60

In correlation both variables are always?

a. same

b. Random

c. Non Random

d. different

25 / 60

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

a. Negative

b. Zero

c. Positive

d. Weak

26 / 60

An r value of 0.80 indicates:

a. Perfect linear correlation

b. Correlation but not linear

c. No linear correlation

d. Strong linear correlation

27 / 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. +1

c. -1

d. 0

28 / 60

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

a. Regression coefficient of X on Y

b. Regression coefficient of Y on X

c. Correlation coefficient of Y on X

d. Correlation coefficient of X on Y

29 / 60

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

a. Data analysis

b. Data mining

c. Data trending

d. Data mapping

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

d. measure the difference between two variables.

31 / 60

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

a. Same direction

b. Same and opposite direction

c. Opposite direction

d. Difficult to tell

32 / 60

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

a. Data analysis and interpretation

b. Data presentation

c. Data retrieval

d. Data promotion

33 / 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 increases

c. as x decrease y decreases

d. as x increases y decreases

34 / 60

Inferential statistics are useful for:

a. Observing natural behavior

b. Determining the probability of something

c. Interviews

d. Construct validity

35 / 60

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

a. Whether an abstract should be included

b. The format for referencing

c. Oral presentation

d. The size of the study

36 / 60

Which of the following are examples of continuous variables?

a. Age in year

b. Birth weight of babies

c. Number of children

d. Distance between

37 / 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. Perfect negative

b. Perfect positive

c. Zero

d. Negative

38 / 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

39 / 60

The range of regression coefficient is:

a. -∞ to +∞

b. -1 to +1

c. 0 to 1

d. 0 to ∞

40 / 60

To investigate the association between two categorical variables we use:

a. z-test

b. Chi-squared test

c. F-test

d. t-test

41 / 60

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

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

b. Under the line

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

d. On a straight line

42 / 60

The best fitting trend is one for which the sum of squares of error is?

a. Zero

b. Less than 1

c. Maximum

d. Minimum (Least)

43 / 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. The estimation parameter

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

44 / 60

The purpose of simple linear regression analysis is to:

a. Predict one variable from another variable

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

c. Obtain the expected value of the independent variable

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

45 / 60

If both variables X and Y increase or decrease simultaneously, then the coefficient of correlation will be:

a. Positive

b. One

c. Zero

d. Negative

46 / 60

A discrete variable is:

a. An example of a qualitative variable

b. Can have two values

c. Can assume only certain clearly separated values

d. Can assume only whole number values

47 / 60

Scatter diagram is considered for measuring :

a. Curvilinear relationship between two variables

b. Predict independent variable

c. Predict dependent variable

d. Linear relationship between two variables

48 / 60

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

a. There is a strong relationship between the two variables

b. There is a relationship between the two variables

c. There is no relationship between the two variables

d. There is a weak relationship between the two variables

49 / 60

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

a. Scatter diagram

b. Pie diagram

c. Histogram

d. Historigram

50 / 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

51 / 60

The coefficient of determination, r2, indicates:

a. The slope of the line of best fit

b. The sum of the residuals from each data point

c. The linear relationship between two variables

d. How closely the data fit a defined curve

52 / 60

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

a. -0.2

b. 2

c. 0.2X

d. -2

53 / 60

A t-test is used to compare:

a. 4 means

b. 5 means

c. 2 means

d. 3 means

54 / 60

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

a. the regression model

b. the correlation model

c. used to compute the correlation coefficient

d. the sample size

55 / 60

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

a. Focus group

b. Case report

c. Cross-sectional study

d. Randomized clinical trial

56 / 60

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

a. +1

b. -1

c. 0

d. r

57 / 60

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

a. The p-value

b. The f-value

c. R2

d. The t-value

58 / 60

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

a. Independent variable

b. Dependent variable

c. Continuous variable

d. Estimate

59 / 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. 30%

d. 9%

60 / 60

Which of the following statements is false?

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

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

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

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

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Statistique Et Méthodologie De La Recherche Test

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