answer with explanation if possible

Twenty-four girls in Grades 9 and 10 are put on a training program. Their time for a 40-yard dash is recorded before and after participating in a training program. The differences between the before-training time and the after-training time for those 24 girls are measured, so that positive difference values represent improvement in the 40-yard dash time. Suppose that the values of those differences follow a normal distribution and they have a sample mean 0.079 min and a sample standard deviation 0.255 min. We conduct a statistical test to check whether this training program can reduce the mean finish time of 40-yard dash. What is the range of p- value for this test? (0.0.025) (0.1.0.15) (0.025.005) (0.05.0.1) r0. (0.15.0.2) Two candidates (A and B) are running for an officer position. A poll is conducted: 200 voters are selected randomly and asked for their preference. Among the selected 200 voters, 104 support A and 95 support B. Provide a 80% confidence interval for the true support rate of candidate A in the population. H [0.434711, 0.525289] H [0.474711, 0.565289] .-H- [0.410759, 0.549241] 9 [0.450753135392411 ' None of above It takes a Christmas tree about 10 years to grow from seed to a size ready for cutting. We want to estimate the average height p. of a 4-year Christmas tree which has been grown from a seed. Assume that the height of a 4year tree is normally distributed. A sample of 20 trees has a mean height 25.25 cm and a sample standard deviation 4.5 cm. This sample produces a confidence interval (CI) for u of length 2.673. Determine the confidence level of this CI. n 90% 7'\" 70% ~ 95% h 30% ."-\" 50% According to a nationwide survey conducted by Statistics Canada, the mean birth weight in Canada is 3.4kg. A doctor wOuId like to gain evidence for the hypothesis that urban mothers deliver babies whose birth weights are greater than 3.4kg. She conducted a statistical test based on 125 Canadian urban newborns with a sample standard deviation 1.25 kg. Suppose that the p-value of this test is 0.0158. What is the mean weight (in kg) for those 125 Canadian urban newborns? n 3_4 \"\"- 3.159623 f'\" 3.238197 s\" 3.540377 -"-\" 3.511 803