CAQs For QT&A Flashcards
From which measure of central tendency is the sum of the deviations (ignoring signs) minimum?
Median
What do you call the two events which can not occur simultaneously?
Mutually exclusive
Which of the following would fit the definition of “statistical independence” of events A and B?
P(A/B) = P(A)
What do you call the data collected first hand by the researcher as?
Primary
A sociologist focusing on popular culture and media believes that the average number of hours per week (hrs/week) spent using social media is greater for women than for men. Examining two independent simple random samples of 100 individuals each, the researcher calculates sample standard deviations of 2.3 hrs/week and 2.5 hrs/week for women and men respectively. If the average number of hrs/week spent using social media for the sample of women is 1 hour greater than that for the sample of men, what conclusion can be made from a hypothesis test where: { 0: − = 0 1: − > 0?
The observed difference in average number of hrs/week spent using social media is significant
What do you refer the approach of drawing conclusions about the population from few units out of full population as?
Sampling
Which of the following statements is true about the type one error?
Type one error means to reject a correct hypothesis
What is plotted on Y axis when we draw an ogive?
Cumulative frequency
What is the parameter of chi-square distribution?
Degrees of freedom
Which of the following statements is true about the null hypothesis?
Any wrong decision related to the null hypothesis results in two types of errors
What would be the value of Y if X is 20 and regression equation of Y on X is: Y = 5 + 0.5X?
15
What is the degree of freedom for a 3 X 3 contingency table?
4
What does the probability of all the events in a sample space add up to?
100%
What do you call the statement that is accepted if the sample data provide sufficient evidence that the null hypothesis is false?
Alternate hypothesis
What do you call a characteristic that varies in quality from one individual to another?
Attribute
What type of correlation exists between the two variables, if the values of the two variables move in opposite direction?
Negative
What is the mode of the following data of marks obtained by 10 students in a class test? 2,8,10,15,12,2,10,2,8,2
2
What is the standard deviation of the following distribution of daily wages earned by a worker in 6 days of a week? 200, 200, 200, 200, 200, 200
0
What is the formula for coefficient of average deviation from median?
A.D./Median
Which of the following statements is true about the geometric mean of two regression coefficients?
It is equal to the correlation coefficient
Which of the following best describes the general probability rule?
P(A or B) = P(A) + P(B) - P(A and B)
What is the original hypothesis known as?
Null hypothesis
In a college 50% of the students play cricket, 40% play badminton and 20% play both the sports. If a student is selected at random, what is the probability that he/she plays either cricket or badminton or both?
0.7
If the ratio of change between the two variables is a constant then what type of correlation will be there?
Linear
What do you name the test as, if the critical region is located equally in both sides of the sampling distribution of test-statistic?
Two tailed
Which of following does analysis of variance compare for several populations?
Mean
Which of the following techniques is an analysis of the relationship between two variables to help provide the prediction mechanism?
Regression
What is the mean of the following sales data? 10,10,10,-10,-10,-10
0
What is the median of the following data of age of 5 children in a study: 4,2,8,10,6?
6
What would be the value of X if Y is 20 and regression equation of Y on X is: Y = 5 + 0.5X?
Can not predict X from this regression equation
“A failing student is passed by an examiner”, is an example of which of the following?”
Type two error
An advertising agency wants to test the hypothesis that the proportion of adults in India who read a Sunday Magazine is 25 percent. What would be the null hypothesis about the proportion reading the Sunday Magazine?
Ho = 25%
If r = 0.4 and one of the regression coefficients is 0.2, what is the vale of the other regression coefficient?
0.8
What is the purpose of goodness of fit test?
“To assess whether the central tendency, variability and distribution of sample is different from that of the population “
On which of the following does the critical value for a chi-square statistic rely?
The degrees of freedom
Which average is the best to use for averaging Speed?
Harmonic mean
What would be the value of correlation coefficient(r) if there is a perfect positive correlation between the two variables?
r = +1
What is the conditional probability of event A given event B has occurred?
P(A/B) = P(A∩B)/P(B)
What do you call events A and B if the outcome of event A is not affected by event B?
Independent
Chi-square test for independence assesses which of the following?
It assesses whether there is a relationship between two categorical variables
What is the coefficient of quartile deviation if Q1 is 15 and Q3 is 45?
0.5
What is the coefficient of variation if variance is 16 and mean is 80?
5%
Which measure of variation cannot be computed for an open-ended distribution?
Range
Which scale represents the highest level of measurement?
Ratio
What category out of the following best fits the Bar diagram?
One dimensional
In which dispersion we ignore Algebraic signs?
M.D
Which is suitable when we measure average population growth in India?
G.M
Which dispersion is also called as Inter Quartile range?
Quartile deviation
When is direct personal investigation method is suitable?
Information is very confidential and complex
What do we use for representing pictograms?
Pictures
In Pie chart the components of a factor is represented by what?
Sectors
What is the geometric mean of 4&5?
4.472
With the help of ogive curves which central Tendency can be identified?
Median
Which dispersion we use in day to day life?
Range
When scope of enquiry is limited and the universe containing a unit having different characteristics make the Intensive study of each unit desirable. which method is more suitable?
Census
If Q1=36, Q3=72 what is the quartile deviation?
18
Which is the best measure of relative measures of dispersion?
Coefficient of variation
What is the standard deviation of the following age distribution? 10,10,10,10,10
0
If there are two groups with 75 and 65 as Arithmetic means and containing 15 and 13 observations, then what is the combined arithmetic mean?
70.35
Which is not a measure of Central Tendency?
Range
Which central tendency can be identified with the help of Histogram?
Mode
Which of the drawbacks of the Direct Personal Investigation method?
It is very costly and time taking process
What is the coefficient of variation if S.D=3 and mean =12 ?
25
The values changing at a percentage rate have to be found, then which is most suitable average?
Geometric mean
What is the mean of 5,5,5,5,5,5 ?
5
The reciprocal of arithmetic mean of the reciprocal of observations is known as which central tendency?
Harmonic mean
What is the value of the sum of the deviations taken from mean value?
0
Which is true interms of pictograms?
Least accurate
Which of the following is the difference between primary and secondary data?
Primary data is more reliable than secondary data
What is the range for the following distribution? 5,5,5,5,5,5,5,5,5,5
0
In quartile deviation we devide the data into how many equal parts?
4
Which of the following is not the source of government publications?
Finance commission report
What is the range of the following sales data? 10,12,14,16,18,20 ?
10
Which of the following is True related to Histogram?
Class intervals are equal
What is the suitable average when data is having extreme values?
Median
