21 Given n 25, 99 confidence level Determine the t value a 2 807 b 2 797 c 2 787 d 2 779 22 JFKtom 21 Given n 25, 99 confidence level Determine the t value a 2 807 b 2 797 c 2 787 22 P( t0025 T t 0025) find the probability a 0 95 b 0 97 c 0 98 d 2 779 d 0 96 23 Given 6 n 20 and 25 Find a 90 confidence interval for a population mean g a 23 9626 g 26 0374 b 65 728 69 172 C 66 183 g 68 717 d 23 435 11 24 565 24 The mean of the masses of random samples of 21 blocks is 24 kg with a standard deviation of 1 50 kg Determine a 90 confidence interval for estimating the mean mass of the population a b c d 23 9626 g 26 0374 65 728 g 69 172 66 183 g 68 717 23 435 11 24 565 25 Measurements are made on a random sample of 23 components drawn from a population size of 100 Assume that the population is normal and the mean measurements of the components in the sample are 67 45mm with standard deviation of 2 93 mm Determine a 95 confidence interval for an estimate of the mean of the population 23 9626 g 26 0374 a b 65 728 g 69 172 66 183 g 68 717 c d 23 435 11 24 565 TEST 111 PROBLEM SOLVING(20 POINTS) Directions Read and analyze each item carefully Solve for the confidence interval of the following problem ROUND OFF YOUR FINAL ANSWERS TO 2 DECIMAL PLACES) Formulae to be used p , za 2 za z ta 2,n 1 I Before a new product is launch by Skin Station Beauty Products, samples are given and feedbacks are gathered from those who got samples Of the 3000 females with ages 20 years old and below who tried the product, 1800 found it effective Find a 99 confidence interval for the proportion who found the beauty product effective (IOpoints) 2 The mean and standard deviation in the aptitude test scores of 20 students in management are 78 7 and 6 3 respectively Find the 95 confidence interval assuming that the population of students in the entire school is normally distributed (IOpoints)

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Question: 21. Given: n=25, 99% confidence level. Determine the t-value. a. 2.807 b. 2.797 c. 2.787 d. 2.779 22. JFKtom 21. Given: n=25, 99% confidence level.

21. Given: n=25, 99% confidence level. Determine the t-value. a. 2.807 b. 2.797 c. 2.787 d. 2.779 22. JFKtom

21. Given: n=25, 99% confidence level. Determine the t-value. a. 2.807 b. 2.797 c. 2.787 22. P(-t0025 < T < t 0025) find the probability. a. 0.95 b. 0.97 c. 0.98 d. 2.779 d. 0.96 23. Given : = 6 ; n = 20 and & = 25. Find a 90% confidence interval for a population mean g a. 23.9626 < g < 26.0374 b. 65.728 69.172 C. 66.183 < g < 68.717 d. 23.435

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