10. (07.04 LC) Mellie is conducting a test on mold spores on bread. She uses 6 slices of bread to compare two strains of mold. She applies one strain to the left side of the bread and one strain to the right side. She flips a coin to decide which strain goes on the right side of the bread. The mold spores that appear on each side are counted and she records them in a table. Bread Number of Spots for Strain 1 Number of Spots for Strain 2 30 19 2 21 17 3 15 15 4 13 12 5 6 9 8 4 If Mellie is to perform an appropriate t-test to determine if there is a mean difference between the number of spots per piece of bread produced by the two strains, how many degrees of freedom should she use? (4 points) O 4 5 6 O 10 O 1211. (07.05 MC) A regression line is used to satisfactorily describe the relationship between amount of car surface per square inch and drying time (in minutes) of 24 cars in a car wax drying time study. The regression analysis is shown. Variable Coeff SE Coeff t Ratio p-Value Constant 4. 5893 0.2784 16.49 0. 0023 Amount of car surface 5. 8493 0.3827 15.30 0 . 0045 R squared = 89.1$ R squared (adj ) = 90.1: Which expression should be used to compute a 96 percent confidence interval for the slope of the regression line? (5 points) 5.8493 + 2.172(0.3827) O 5.8493 + 2.183(0.3827) O 5.8493 + 2.177(0.3827) O 4.5893 + 2.183(0.2784) 4.5893 + 2.177(0.2784)12. (07.05 LC) Shoe size and height, in inches, of 15 randomly selected high school students are compared. Which significance test should be used to see if height and shoe size have a linear relationship? Assume all test conditions are met. (4 points) t-test for slope of regression line O Two-sample z-test O Two-sample t-test O Two-proportion z-test One-proportion z-test1. (07.01 LC) Which of the following statements would be appropriate to investigate a claim that the mean speed of drivers through a neighborhood exceeds the posted limit of 25 miles per hour? (4 points) The alternative hypothesis states the mean speed of drivers in this neighborhood is greater than 25 miles per hour. O The alternative hypothesis states the mean speed of drivers in this neighborhood is less than 25 miles per hour. O The alternative hypothesis states the mean speed of drivers in this neighborhood is less than or equal to 25 miles per hour. O The null hypothesis states the mean speed of drivers in this neighborhood is less than 25 miles per hour. The null hypothesis states the mean speed of drivers in this neighborhood is greater than 25 miles per hour. 2. (07.01 MC) A t statistic was used to conduct a test of the null hypothesis Ho: M = 7 against the alternative Ha: U = 7, with a p-value equal to 0.034. A two-sided confidence interval for u is to be considered. Of the following, which is the largest level of confidence for which th confidence interval will NOT contain 7? (4 points) A 90% confidence level A 93% confidence level A 95% confidence level A 97% confidence level A 99% confidence level3. (07.01 LC) Buyers are skeptical of a speed boat advertisement that claims the newest model gets an average of 24 miles per gallon. They believe the dealer is overstating the average. Which null and alternative hypotheses should the buyers test? Let u represent the true average gas mileage. (4 points) O Ho: H 24 miles per gallon O Ho: H = 24 miles per gallon, Ha: H > 24 miles per gallon Ho: M = 24 miles per gallon, Ha: U