ANSWERS ONLY

It is calculated by dividing the sum of the observations by the total number of observations. * 0 Standard Dewation O Variance Which of the following is the correct formula in finding the mean of discrete random variable? * O u=zx7Pr>o O u=X+P(X) O U:ZX'P(X) O FIX-POO Which of the following describes a continuous random variable? * 0 number of breads baked in a day 0 number of siblings In a family 0 average amount of electricity consumed 0 number of students enrolled in a year If a research er selected ten schools at random and then interviewed each of the teachers in those schools. what kind of sampling method does the researcher used? * O Cluster random sampling 0 Simple random sampling 0 Stratied random sampling 0 Systematic random sampling Refer to the Probability Distribution below. X l 2 3 4 5 6 P00 2/21 4/2] 5/21 4/2] 2/2]- What is the H2) . PM)? A. 9/441 B. 16/441 c. 25/441 D 121/441 Which of the following best describes about sampling distribution of the sample mean? * O lndividualpopulau'on values 0 lndividualsamplevalues 0 Population Parameter 0 Sample statistic What formula should be used when the variance is known in the sampling distribution of sample mean for normal population? A.ax: 3-6:: E1 (llmjh 2 . _ s D..s X 11 Which of the following employs simple random sampling? * O picking a house randomly and the picking 5 more on the same street 0 drawing names randomly from a covered box 0 selecting every 10th person that you see 0 picking a random location on a map and then the nearest two houses are chosen Which ofthe following is the correct formula in finding the variance of sampling distribution of sample means? A. ox = ZIP(X) . (X , :02] B. ox = ZIP(X) + (X , W] C. a; = ElPOO +(xrm21 n. a: = ZIP(X) , (km The average weight of the whole class under study is 58 kg. The words whole class refer to * 0 Parameter 0 Population Which of the following statements is TRUE? * O As the sample size increases, the variance of the sample mean increases. O As the sample size decreases, the variance of the sample mean decreases O As the sample size increases, the variance of the sample mean decreases. O As the sample size decreases, the variance of the sample mean increases. Which of the following is the correct formula in finding the standard deviation of discrete random variable? A. o = VEX2 . P(X) . 12 A. o = VEX2 . P(X) + 12 C. o = VEX2 . P(X) - 12 C. o = VEX2 . P(X) = 12 O A O B O c O D Which of the following is the correct formula in finding the variance of discrete random variable? A. 02 = [ X2 . P(X) + 12 B. 62 = [ X2 . P(X) - H2 C. o2 = [ X2 . P(X) + 12 D. 02 = [ X2 . P(X) . H2 O A O B O c O D What is the standard deviation of the probability distribution of the given data, [ x2 . P(X) = 3.0 and u = 1.5? A. 0.85 B. 0.86 C. 0.87 D. 0.88 O A O B O c OD- . .. Based on the given table, find P(X > 2) X 2 3 6 P(X) 1/2 1/3 1/6 5/6 1 O 3/6 4/6 Which of the following is NOT a property of normal curve? * O The total area of the normal curve is 1 O The normal curve is bell - shaped O The mean, median and mode coincide at the center O The curve is asymmetrical about its center