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L Answer the following. 1. Find the tvalue fer which the area on the right tail of the [distribution is 0.05 and the number of degrees of'eedam is 21. Find the tvalue for which the area on the right tail of the t-disu-ibuiion is 0.005 and a sample size of 80. Find the 95"3 percentile of the distribution with 29 degrees of freedom. Find the 98111 percentile of the tdisn-ibutien if the sample size is 21. What is the area to the right of 2.050 under a t-disa'ibution with 30 degrees of freedom? PPS-\"N II. Problem-solving. 6. Jo-ann owns a jewelry store. She used 150 pairs of earrings as her sample for the different designs. The population standard deviation of the price of the earrings is 65 pesos. Suppose that Jo-Ann wants a 98% level of confidence to determine the mean price of all her earrings she is selling. Compute the margin error of her estimate. 7. The population of SULU Hornbill (one of the endangered bird species of the Philippines) has a standard deviation of 40. Compute for the length of the confidence interval for a 90% confidence level having a sample size of 150 and a sample mean of 65. 8. You are planning to buy a laptop with a good quality in order to attend the online class. The average price of 150 laptop is Php25,500 with a margin of error of Php 1234.75 and a confidence level of 92% Determine the length confidence interval using this information