Statistics Questions and Answers

41-Condition for applying Central Limit Theorem (CLT), which approximates the sampling distribution of the mean with a normal distribution, is
(A) n > 30
(B) 2n < 30
(C) n/N > 5
(D) n < 30
42-The group that does not receive the experimental treatment condition is the ________.
(A) Independent group
(B) Treatment group
(C) Control group
(D) Experimental group
43-Life expectancy at birth means
(A) Average expected length of children at the time of birth
(B) Average expected length of life of a person at the time of birth
(C) Average expected length of life of a person at the time of death
(D) None of the above
44-In statistical hypothesis test of equality of means, such as H0: μ = 12, if α = 5%
(A) 5% of the time we will make a correct inference
(B) 5% of the time we will say that there is no real difference when there is a real difference (Type –II error)
(C) 5% of the time we will say that there is a real difference when there is no real difference (Type–I error)
(D) 95% of the time we will make an incorrect inference
45-Which of the following statistical software is used to calculate sample size?
(A) G-power
(B) Open EPI
(C) SAS & R
(D) All of the above
46-The price elasticity of demand is defined as
(A) The percentage change in the quantity demanded of goods divided by the percentage change in the price of that good
(B) The percentage change in the quantity demanded divided by the percentage change in income
(C) The percentage change in income divided by the percentage change in the quantity demanded
(D) None of these
47-The Chi-square goodness-of-fit test can be used to test for
(A) Probability
(B) Normality
(C) Difference between population means
(D) Significance of sample statistics
48-Non-Sampling error is reduced by
(A) Reducing the Amount of Data
(B) Increasing Sample Size
(C) Decreasing Sample Size
(D) None of these
49-What is the relationship between sample size and the standard error of the mean?
(A) The standard error decreases as the sample size increases
(B) The standard error increases as the sample size increases
(C) The standard error is unaffected by the sample size
(D) The standard error decreases as the sample size decreases
50-ANOVA test is based on which assumption?
(i) The samples are randomly selected
(ii) The population variance is equal to some common variance
(iii) The population is normally distributed
(iv) The population has statistical significance
(A) i and ii only
(B) i, ii, and iii only
(C) ii and iii only
(D) All of the above
ANSWERS:
41-(A), 42-(C), 43-(B), 44-(C), 45-(D), 46-(A), 47-(B), 48-(D), 49-(A), 50-(C)