A teacher at a local high school claims that students in her school use less than 7.3 hours of screen time each day on average. Suppose she takes a sample of 50 students in her school and conducts a hypothesis test. She finds a p-value of 0.0367 for the corresponding hypothesis test. Which of the following would the correct conclusion for this test at a significance level of 5%? There is not enough evidence to support her claim. There is not enough evidence to refute her claim. There is enough evidence to refute her claim. o. There is enough evidence to support her claim. For the teacher in the previous question, which of the following must be true in order for results to be valid? Choose all that apply. The population standard deviation must have been known. @ The sample should have been a simple random sample. The screen time of students at her school must be normally distributed. There needs to be at least 500 students in her school. When creating a confidence interval for a mean or proportion, which of the following adjustments will result in a narrower interval? [ Select ] the confidence level. [ Select ] the sample size. When creating a confidence interval for a mean or proportion, which of the following adjustments will result in a narrower interval? [ Select ] the confidence level. [ Select Increasing Decreasing the sample size