12. You have observed that it takes an average of 15 minutes with a standard deviation of 1.5 minutes when you commute from your house to your first period class in the moming. If the computed zescore Is -1 5. then what does it mean? a it means that you are late for the first-pened class be It means that you come early in the first-period class It means that you are just on time for the first-period class d Il cannot be determined since there is no time givon, 13. Which of the following refers to a chance sampling method? a Random sample b Random sampling e Systematic sample d. Systematic sampling 14. What do you call a numerical value calculated by using all the data in a population? a. Parameter b. Random Sample c. Statistic d Vanance 15. What refers to a numerical value calculated by using only the data from a sample? a Parameter b. Random Sample c Statistic . Variance 16. What is commonly known as average and could be calculated by adding all values in n data and dividing the sum with the number of values? a Parameter b. Mean c Median d, Vanance 17 What refers to the degree of spread or variability of a data? Parameter b. Mean a Median d. Variance 18, What is the mean of 13, 27, 29. 17 and 147 19. Which of the following symbols denotes population mean? a X C. P 20. There are stand and deviation units at the baseline of a normal curve, II. A. Given u = 62 and a = 8, find thee z-score value that corresponds to each of the following scores (up to two decimal places) 1. X = 70 2. X = 82 3.X = 42 B. Use the z-table to find the area of the following 1 2=0,56 2. z = 1.32 3.Z=-258 4. 23-1.04 C. Determine each of the following areas and show these graphically (draw a normal curve) 1. to the left of z = 2.78 2. above z = 1.46 3, Between 2 = 0.78 and z =-1.95 between 2 = 0.76 and z = 2.88 Ill Solve the problem below, SHOW YOUR SOLUTION 1. The average number of lilos of meat climbed up to 300 pesos with a standard deviation of 60 pesos, Assume that the variable is normally distributed. What is the probability that a public market selected randomly will set their price to more than 280 pesos? Hint: Use POX>280) SAA Read rach question carefully and select the correct answer from the alteration that follows. Write the letter of the condet answer in your paper For non-multiple choice items, give the carred answer. 1. What is the shape of a formal curve distribution? a Circle b. Square c Rectangle d. Del-shaped 2. What is the total area under the nonnal curve? 1 0997 0. 0.95 3. What is the area that falls within 2 standard deviations from the mean? 6 0 997 C 0.05 4. Which of the following is TRUE about the characteristics of a normal curve distribution? a The curve divides into 4 regions The curve is asymmetrical about the moan The curve edends indefinitely to the right side only d The total area under the normal curve is 100% Suppose that the mean is 35 and the standard deviation is 4. What is the percentage of 35 and above? 50% b. 60%% 95% d. 59 745 6: Which of the following is TRUE about standard normal distribution? a. J.=Dando =0 bu= 1 ando=1 c u=0 ando = 1 d us 1 ando= 0 7. It is a procedure when a raw score is converted to a z-scome. . Concluding'a raw score b. Normalizing a row score Summarizing a raw score d. Standardking a few scare 8. If a random variable x is greater than the mean, then which of the following is TRUE about the z-score? a. The z-score is at the left side of the mean by The z-score is on the right of the mean e. The z-score is the same position of the mean . The z-score is either on the left side or on the right side of the mean 9. How will you find the area if both z-score are given in the right side of the mean? a Subtrod the two arcos b. Multiply the two greas C. Divide the two areas d. Add the two areas 10. What is the equivalent z-score of x = 13, u = 10 and o = 27 3 25 b. 1.5 0 -1.5 d -25 11. Suppose that the score in Mathematics exam is normally distributed with a mean of 20 and a standard deviation of 4, What percentage of the scores fall between 18 and 267 a 64 27% b, 64.72% 6 62 74% d. 62 47%