4. Claim: u > 25; a = 0.05. Sample statistics: x = 26.2, s = 2.32, n = 17. Assume the population is normally distributed. 5. A research center claims that at most 18% of U.S. adults' online food purchases are for snacks. In a random sample of 1995 U.S. adults, 20% say their online food purchases are for snacks. At a = 0.10, is there enough evidence to support the center's claim? 6. An auto manufacturer claims that the variance of the gas mileages in a model of hybrid vehicle is 0.16. A random sample of 30 vehicles has a variance of 0.26. At a = 0.05, is there enough evidence to reject the claim? Part 2: Correlation and Linear Regression: Label each part and box your answer 7. The number of hours 9 students spent studying for a test and their scores on that test are as follow: Predictor Dependent variable variable Hours spent studying Test scores (a) What is the r value? 0 40 (b) Is it a negative or positive correlation? 51 (c) Find the linear equation from this data 64 69 (d) What is the test score if a student studies for 73 6.5 hours? 75 93 90 95