Force Completion This test can be saved and resumed later. The timer will continue to run if you leave the test. Your answers are saved automatically. Remaining Time: 1 hour, 22 minutes, 41 seconds. Question Completion Status: 1 30 6 70 80 90 109 110 12 13 14 150 16 170 18 19 201 210 220 23 2409 25 260 27 280 29 3019 31 320 33 34 350 360 370 38 39 40 > A Moving to another question will save this response. Question 1 of 40 > > Question 1 2 points Save Answer A researcher wishes to estimate the proportion of fish in a certain lake that is inedible due to pollution of the lake. How large a sample should be tested in order to be 99% confident that the true proportion of inedible fish is estimated to within 8%?Question Completion Status: BD 40 6 70 90 100 110 12 13 14 150 160 170 18 190 200 210 220 23 2409 25 260 27 280 29 30 0 31 320 330 340 350 360 370 380 1390 40 A Moving to another question will save this response. > Question 6 4 points Save Answer Estimate a simple linear regression model for the following data (Y is a dependent variable and X is an independent variable): X 5 -5 5 -4 6 -3 6 -2 8 -1 Use Excel's Regression tool to answer the following questions. To copy the data set, highlight the table, press Ctri-c, click on the Excel cell to which you want to copy, then press Ctri-v. Fill in Multiple Blanks What is the slope of the estimated line? In your answer, show one (1) digit to the right of the decimal point, for example, 1.0, 1.2. Apply the appropriate rounding rule if necessary. What is the Y-intercept? In your answer, show one (1) digit to the right of the decimal point, for example, 1.0, 1.2. Apply the appropriate rounding rule if necessary.Question 12 2 po When conducting a hypothesis test about a single mean, other relevant factors held constant, increasing the level of significance from 0.05 to 0.10 will reduce the probability of a Type I error. O True O FalseQuestion 13 2 points Save Answer A health fitness research group wishes to estimate the mean amount of time (in hours) that members of a fitness center spend each week exercising at the center. They want to estimate the mean within a margin of error of 0.4 hours with a 95% level of confidence. Previous data suggest that the population standard deviation (sigma) is 2.6 hours. What is the smallest sample size that meets these criteria?Question 14 2 points Save Answer If the regression equation is Yhat =2 - 0.4X, what is the value of Yhat when X = -3? O 3.2 O -10.0 O 14.0 0 0.84 Moving to another question will save this response. >> Question 18 4 points Save Answer A random sample of 100 automobiles traveling on a section of an interstate showed an average speed of 65 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 15 mph Multiple Blanks Do calculations in Excel. Do not round intermediate calculations. Round your final answer to the nearest tenth, that is, show one (1) digit to the right of the decimal point, for example, 1.0, 1.2. Apply the appropriate rounding rule if necessary. You can use the "Format Cells..." option in Excel to show the required number of decimal places (Excel will automatically round the number up or down). Do not show any symbols or words in your answer. The 86.9% confidence interval for the average speed is from mph to mph.Question 23 2 points Save An The null hypothesis always includes an equal (=) sign. O True O Falsehow A Moving to another question will save this response. Question 25 In hypothesis testing, the alternative hypothesis is O the hypothesis tentatively assumed true in the hypothesis-testing procedure O the hypothesis concluded to be true if the null hypothesis is rejected O the maximum probability of a Type | error O All of the answers are correct.Question 27 2 points Save Ans In a multiple regression analysis, three independent variables are used in the equation based on a sample of forty observations. What are the degrees of freedom associated with the F-statistic? O 3 and 36 O 4 and 40 O 2 and 39 O 3 and 39380 390 40 .> A Moving to another question will save this response. > Question 29 2 points Save Answer You performed a right-tailed hypothesis test and your sample gave you a test statistic in the left tail. Which of the following is considered the appropriate next step in this hypothesis test? O Fail to reject the null hypothesis. O Change the direction of the hypotheses. Change the sample and do the test again. O Change the level of significance of your test.Question 31 2 points Save Answer A major airline company is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that on the average 18% of the company airplanes have arrived late. In a random sample of 1,240 airplanes, 310 airplanes have arrived late. If we are conducting a hypothesis test of a single proportion to determine if the proportion of late arrivals has increased, what is the correct statement of null and alternative hypotheses? O Ho: p $ 0.25; Ha: p > 0.25 O Ho: p = 0.18; Ha: p # 0.18 O Ho: p 0.18; Ha: p $ 0.18 O Ho: p S 0.18; Ha: p > 0.18