allowing problem. It is claimed that the average number of vehicles using the Lee Super Plaza parking lot each day is 244 vehicles. A statistics student recorded the mi vehicles are shown below . 230 Penicles using the parking lot over a two-week period, A table of the number of he number of 244 235 233 243 240 248 249 238 247 235 no the collected data present sufficient evidence to indicate that the average 254 250 249 number of vehicles using the Lee Super Plaza parking lot is lot is different from 244 vehicles? Use 0.05 level of significance and assume that the population is normal. Solve the following problem. In the past, the average age of teachers in Taclobo National High School was 40 years. Recently, the school has been hiring younger teachers. Some of them are even fresh graduates from the different colleges and universities in the country To determine whether there has been a decrease in the average age of all the teachers in Taclobo National High School, a random sample of 29 teachers was selected. The average age of the sample was 35 years with the standard deviation of 1 1 years. Using 0.05 level of significance. determine whether the age average of all the teachers in Taclobo National High School has decreased. Assume normality in the population. Solve the following problem. The owner of a mobile phone store at Robinsons was not happy when he learned that the average number of mobile phones sold daily was only 8 mobile phones. He hired a new seller and told him to tally the daily sales for 20 days. The following are the number of mobile phones sold for the past 20 days. 9 9 9 8 9 9 11 12 12 16 10 12 8 11 17 18 15 14 17 14 Do the collected data present sufficient evidence to indicate that the average number of mobile phones sold daily has increased? Use 0.05 level of significance. Assume normality in the population