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ACTIVITY 1: IDENTIFYING THE LENGTH OF A CONFIDENCE INTERVAL You are planning to buy a cellphone with a good quality in order to attend the online class. The average price of 50 cellphones is Php13,500 with a margin of error of Php 273.65 and a confidence level of 99% What is the lower limit? What is the upper limit What is the confidence interval? . If you have 13,000, is the amount lies within the confidence interval?ACTIVITY 2: COMPUTING FOR THE LENGTH OF THE CONFIDENCE INTERVAL Direction: In the following activities, read each situation carefully to solve each problem. No. Confidence Write your answer on a separate sheet of paper. Level 1. A random sample of size 70 has a standard deviation of 15. What is the margin 1-5 of error for a 92% confidence level? Write all the given data based on the problem statement and show the complete solution. A random sample of size 100 has a standard deviation of 25. What is the margin LANT Mo of error for a 90% confidence level? ACTIVITY 3: COMPUTING APPROPRIATE SAMPLE SIZE USING THE LENGTH OF INTERVAL EGE Direction: Complete the table below by supplying the needed information and solve for TESSORI the appropriate sample size n. 1. Confidence level 99%, AR Population standard deviation = 30, margin of error = 2.5 Confidence level 90%, Population standard deviation 0 =27, margin of error = 7.5 3. Confidence level 95%, MOMACH Population standard deviation o = 9, margin of error = 4.5 Confidence level 92%; CHAMBER OF LEARNING Population standard deviation o = 45, margin of error = 3 VICTORIA, OR. MINDOR Confidence level 98%, Population standard deviation o = 30, TCHR. DOMI margin of error = 2.5