statistics and probability multiple choice questions

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choose the correct answer from the given alternatives 1. what is any subset of the sample space called? a. an event b. an experiment c. a mutually exclusive event d. independent events 2. which of the following are the similarities between the standard normal distribution and the t distribution? a. both distributions are symmetric (bell–shaped) about the mean. b. neither distribution meets the horizontal axis. c. total area under each of these curves is 1.0. d. the mean of both of these distributions is zero. e. all of these 3. a definite plan for obtaining a sample from a sample frame can be termed as: a. sampling design b. sampling unit c. sampling frame d. sampling error 4. branch of statistics which study the unknown aspects of a population distribution is a. estimation b. hypothesis testing c. inferential statistics d. descriptive statistics 5. the mistakes or biases which are considered …

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he distribution are not equal and located at the peak d. the normal curve falls off smoothly in either direction from the central value asymptotically 10. for a population consisting of four (4) members, how many samples of size two (2) can be formed with replacement and without replacement respectively? a. 16 & 2 b. 16 & 12 c. 16 & 6 d. 8 & 6 e. none of these 11. among the types of sampling, which one of the following different from the others a. stratified sampling b. cluster sampling c. convenience sampling d. systematic sampling 12. the number of products manufactured in the factory in a day are 3500 and the probability that some pieces are defected is 0.55 then the standard deviation of binomial probability distribution is: a. 43.87 b. 29.43 c. 39.69 d. 1925 e. none of these 13. which one of the following probability distribution …

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l hypothesis d. none of these alternatives is correct 19. which of the following refers to numbers that indicate the spread or scatter of observations in the data set? a. measures of center b. measures of location c. measures of variability d. measures of shape 20. an experiment involves selecting a random sample of 256 middle managers for study. one item of interest is annual income. the sample mean is computed to be $45,420, and the sample standard deviation is $2, 050. what is the 95 percent confidence interval? a. ($45, 169; $45, 671) b. ($46, 168; $ 47, 668) c. ($45, 210; $45,630) d. ($46, 000; $47, 000) e. none of these 21. the measure of location which is the most likely to be influenced by extreme values in the data set is the a. range b. median c. mode d.. mean 22. in order to test the following …

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r b. the confidence level of that parameter d. the point estimate of that parameter 27. which statement is not true about the 95% confidence level? a. confidence intervals computed by using the same procedure will include the true population value for 95% of all possible random samples taken from the population. b. the procedure that is used to determine the confidence interval will provide an interval that includes the population parameter with probability of 0.95. c. the probability that the true value of the population parameter falls between the bounds of an already computed confidence interval is roughly 95%. d. if we consider all possible randomly selected samples of the same size from a population, the 95% is the percentage of those samples for which the confidence interval includes the population parameter. 28. branch of statistical inference which assumes that the underlying population distribution is known is a. parametric …

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computed by first squaring the differences between a. observed frequencies and expected frequencies. b. observed frequencies and the total sample size. c. observed frequencies and observed percentages. d. expected values and observed percentages. 32. the degrees of freedom for the chi-square test statistic when testing for independence in a contingency table with 4 rows and 4 columns would be a. 12 b. 5 c. 7 d. 9 33. which of the following is not an assumption of parametric inference methods? a. data is quantitative c. sample is sufficiently large. b. population has a known distribution. d. data is qualitative. 34. the chi-square test can be used: a. for pairwise multiple comparisons of means. c. to test for homogeneity of proportions b. to test for difference in two variances. d. to make inference about a population mean. 35. the boundaries of the confidence interval are called: a. confidence level b. the …

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choose the correct answer from the given alternatives 1. what is any subset of the sample space called? a. an event b. an experiment c. a mutually exclusive event d. independent events 2. which of the following are the similarities between the standard normal distribution and the t distribution? a. both distributions are symmetric (bell–shaped) about the mean. b. neither distribution meets the horizontal axis. c. total area under each of these curves is 1.0. d. the mean of both of these distributions is zero. e. all of these 3. a definite plan for obtaining a sample from a sample frame can be termed as: a. sampling design b. sampling unit c. sampling frame d. sampling error 4. branch of …

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