Statistics

1 . Decreasing the sample size, while holding the condence level the same. will do what to the length of the condence interval? A. make it bigger C. it will stay the same B. make it smaller D. cannot be determined from the given infomtalion 2. Given: n 2 3t) and cr is known, what is the appropriate distribution? A. z b. t C. p D. r 3. Which of the following refers to a range of values used to estimate the parameter which can be oaloulated using two numbers or values which may or may not contain the value of the parameter being estimated? A. Confidenoe level C. margin of error B. Interval estimate D. degree of freedom 4. Which of the following quantifies the probabilities in which. a member of the sample would fall within a known interval of the true population, 1-a. if ais the allowable sampling error? A. Degree of freedom C. confidence interval B. Margin of error D. confidence level 5. The interval defined within the true population where the members otthe sample are expected to be tound. A. Confidenoe level C. interval estimate 3. Confidence intervat D. degree of freedom 6. Which of the following is the formula for standard error estimate for t? ..,....J5 B...J5 J5 Mam. Ill 3n n 7. This distribution is ideally used when n s 30 and the standard deviation or variance of the entire population is unknown, or that only standard deviation given is from the sampte. A. Normal distribution C. z-distribution 3. Sampling distribution D. t-distribution B. This refers to the number of independent observations in the set of data or the number of variables that are free to vary. A. Margin of error C. standard error E. Degree of freedom D. parameter iv 9. This distribution is ideally used when n 2 30 and the standard deviation or the variance of the entire is given A. t-distribution C. z-dislribution B. sampling distribution D. normal distribution For numbers 10-12. A group of students in their research would like to determine the EC! of Mindanao Science State University. They followed the instructions given by their research adviser. Through simple random sampling, they got 150 students from a population of 3,000 students. Among sampled students. the average EQ score is 115 with a standard deviation of 10. 10. What is the sample mean? A. 10 B. 3,000 C. 115 D. none ofthese 1 1 .To solve for the standard deviation of the population, compute the standard error. A. 0.82 B. 0.995 com D. .0.001 12. What is the 99% condence interval for the students' E0 score? A. 114:1; 3.1 B. 112.90 to 117.10 C. 111.1 to 115.6 D.111.06 to 115.1 13. Suppose that we wanted to estimate the true average number of eggs a queen bee lays with 95% oontidence. The margin of error we are willing to accept is 0.5? Suppose we also know that s is about 10. What sample size should we use? A. 15.36 B. 15.37 C. 25.53 D. 26.50 For numbers 14-15 The Principal wants to know the mean at all entering trainees in a boot camp. The mean age of a random sample of 25 trainees is 18 years and the standard deviation is 1.3 years. The sample comes from a normally distributed population. Use a = 0.1 to find what is asked. 14.What is the error E? A. 0.83 B. 0.73 C. 0.63 D. 0.53 15.What is the interval estimate at the population mean? A. 19.27t020.71 B. 18.37 to 19.73 C.17.27m1B.73 D. 17.07to18.03