MODULE 12: Calculating the Small-Sample Confidence Interval Estimate for Mean when o is unknown Individual work. Directions: Solve the following problem individually. Round off your answer into three decimal places. (SHOW YOUR SOLUTION) 1. 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. 2. A random sample of 15 students was selected from a population size of 100 (normal) in a certain dormitory. The mean of weekly expenditures of the sample students is P400 with P17.50 standard deviations. Construct a 95% confidence interval for the average amount of expenditure of the resident in the dormitory.

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