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Suppose the comelation coefficient is 0.9. The percentage of variation in the response variable explained by the variation in the explanatory variable is OA none of the other answers OB. 8.1 % OC. 90% COD. 9% OE 0.81% OF 0.90% 80 0% OH 81% Time Remaining: 02:33
Use the sample data and confidence level given below to completo parts (a) through (d) In a study of cell phone use and brain hemispheric dominance, an internet survey was e-mailed to 2515 subjects randomly selected from an online groue invived with ears 1075 surveys were retumed. Construct a 5% confidence interval for the proportion of returned surveys Click the icon to view a table of z scores a) Find the best point estimate of the population proportion p (Round to three decimal places as needed) b) Identify the value of the margin of error E E4 Round to three decimal places as needed) c) Construct the confidence interval ** (Round to three decimal places as needed) Time Remaining: 02 32 50 Next
L (Round to three decimal places as needed.) b) identify the value of the margin of error E E- (Round to three decimal places as needed.) c) Construct the confidence interval CED (Round to three decimal places as needed.) d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below OA. 95% of sample proportions will fall between the lower bound and the upper bound. OB. There is a 95% chance that the true value of the population proportion will fall between the lower bound and the upper bound OC. One has 95% confidence that the interval from the lower bound to the upper bound actually does contain the true vidue of the population proportion OD. One has 95% confidence that the sample proportion is equal to the population proportion Time Remaining: 02:31
Listed below are the lead concentrations in ugg measured in different traditional medicines. Use a 0.10 significance level to test the claim that the mean lead concentration for all such medicines is less than pag Assume that the sample is a simple random sample 18 13.5 0.5 9 22 885 18 2018-0 Assuming all conditions for conducting a hypothesis tust are met, what are the null and allemative hypotheses? OA 10 pa H₁18 90 OCH 18 p H₁ <18 Determine the test statistic found to two decimal places as n Determine the P-value (Round to three decimal places as needed) State the final conclusion that addresses the original dam OBH 18 H, 18 pag OD. H₂18pp/ H₂18 pa Time Remaining: 02:31:12 Ne:
Listed below are the lead concentrations in pg/g messured in different traditional medicines Use a 0.10 significance level to test the claim that the mean lead concentration for all such medicines is less th valg Assume that the sample is a simple random sample 18 135 950 22 885 10 20 18:0 OA Hp 15 po H₁:18 p OC H₂H-18 pola H₂ p 16 pag Determine the test statistic (Round to two decimal places as needed) Determine the Pa dlound to three decimal placas as needed) State the final conclusion that addresses the original claim. H There is OB H₂18 p H₂10 p OD. 10 pla H₂18 pa evidence to conclude that the mean lead concentration for all such medicines s 18 pag Time Remaining: 02:30:50