CAQs For QT&A Flashcards
(75 cards)
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
