Practice Welfare Economics Questions and Answers

• Two data sets of sizes 6 and 9 have standard deviation 3 and 4, respectively, and arithmetic means 4 and 4, respectively. The standard deviation of combine...
• A physical instructor claims that the mean weight of students in school is greater than 82 kg with standard deviation 20. If a sample of size 81 students i...
• If moment generating function of continuous random variable X is (λ /λ−t) ;t < λ, then E(X3) equals to:
• For frequency distribution presentation , which option is wrong.
• The arithmetic mean of the following frequency distribution of number of accidents X on week working days is: X:                     �...
• Which option is WRONG?
• If P(A) = 0.4; P(B ∣ A) = 0.05; P(C ∣ A) = 0.04; P(B ∣ A ∩ C) = 0.09; P(C ∣ A ∩ B) = 0.0 7, then the probability of occurrence of all events eq...
• If the population skewness of the observations 8,6,3, 1,2,5 is 0.233, then the population skewness of 16,12,6,2,4,10 is:
• If the first, fifth and ninth decile of frequency distribution xi ∣ fi are 3,10,16, respectively, then Kelly's coefficient of skewness is:
• For the frequency distribution of income (in lakh) of the employees in factory Class                      1.5-2.5          �...
• These seventh decile (D7) of data set 4, 3, 10, 9, 1 is
• For the distribution X:            1              0              1 P(x):      0.3          0.5     ...
• If the difference between the rank of the 4 observations are 2.5, 0.5, -1.5, -1.5, then Spearman's rank correlation coefficient equals to:
• X1 and X2 represent number of occurrences of event A and 8 that follow Poisson distribution with mean rate λ1 and λ2 , If Y1 and Y2 are inter-occurrence ...
• For the distribution with unknown θ We set the testing of hypothesis H0 : θ = 1 vs H1 : θ = 2. When the critical region X ≥ 0.4, the value of probabi...
• For the production data Year:                      1              2              3             ...
• The grouped data for the observations are Class:                     1-3          3-5          5-7 Frequency:    ...
• For the data set X:            1              2              3              4              ...
• The value of a and b so that the following is probability mass function X:                            0            �...
• If A,B and C are arbitrary events, then P(A ∩ B ∩ C) equals to:
• If the odds in favour of any random event A are 5 : 6, then the odds against the event are:
• Which of the following is the most relevant for deriving a point estimate?
• For the cumulative distribution function the upper quartile point is
• For ANOVA table the F - statistics is:
• If each observation is halved then the coefficient of quartile deviation
• If the first quartile of data set 8,10,8,7,9 is 7.5, then the value of quartile deviation is
• The interquartile range excludes ___ of the values.
• For the frequency distribution of X number of grammatical mistakes per line is as follows. X:            0              2     ...
• If price-quantity are related for base year (0) and current year (1) are ∑ : p0q0 = 260,∑ : p1q0 = 395,∑ : p0q1 = 264,∑ : p1q1 = 422, then Marshall...
• Which one is not non-probability sample method
• If A and B are manually exclusive events such that P(A)P(B) > 0 , then which option is correct?
• Which of the following is an example of using a sample to make inference about a population?
• If r and R denote correlation and multiple correlation coefficient for the data set for X1, X2 and X3 . Which option is correct?
• Which option is incorrect for the component of ti.me series.
• Which one is not basis of classification of data.
• The purchasing power of money is equal to:
• Using the method of semi-averages, secular trend is measured when:
• The mean and median of the distribution are 10 and 11 respectively, then the mode equals to
• Fundamental principles of design of experiment are (I) Randomization (II) Replication (III) Local control Which option is correct?
• The prices (in ₹) of different yarns (per kg) in two consecutive years are as follows. By simple aggregative method, the net price changes in % is: ...