As Concrete Cures It Gaires Strength The Following Data Represent The 7 Day And 28 Day Strength In Pounds Per Square In 1 (44.3 KiB) Viewed 19 times
As Concrete Cures It Gaires Strength The Following Data Represent The 7 Day And 28 Day Strength In Pounds Per Square In 2 (40.45 KiB) Viewed 19 times
As concrete cures, it gaires strength The following data represent the 7-day and 28-day strength in pounds per square inch (psi) of a certain type of concrete Complete parts (a) through (1) below. 7-Day Strength (psi), 2480 3380 2300 3330 33900 28-Day Strength (psi), y 4120 5020 4070 4850 5220 (a) Treating the 7-day strength as the explanatory vanable, x, use technology to determine the estimates of Bo and B. Bobo - (Round to one decimal place as needed.) Dz -b- (Round to four decimal places as needed) (b) Compute the standard error of the estimate, se (Round to one decimal place as needed) (c) A normal probability plot suggests that the residuals are normally distributed Determine sibi Use the answer from part (b) Sb=0 (Round to four decimal places as needed) (d) A normal probability plot suggests that the residuals are normally distnbuted Test wiwthor a finear relation exists between 7-day strength and 28-day strength at the a=0.05 level of significance State the null and alterative hypotheses. Choose the correct answer below. On Ho Pro Hj. By > 0 ов. Но о 0 H₂ 10 OG Ho B10 Hy 0 OD. Ho too Hi Hono
Determine the P value of this hypothesis test P-value = ((Pound to three decimal places as needed) What is the conclusion that can be drawn? OA Reject Ho and conclude that a linear relation exists between the 7-day and 23-day strength of a certain type of concrete at the a=0 05 level of significance O B. Do not roject Ho and conclude that a linear relation exists between the 7-day and 28-day strength of a certain type of concrete at the a=005 level of significance c. Do not reject Hy and conclude that a linear relation does not exist between the 7-day and 28-day strength of a certain type of concrete at the a = 0,05 level of significance OD. Rrject Hy and conclude that a linear relation does not exist between the 7-day and 28-day strength of a certain type of concrete at the = 0.05 level of significance le) Construct a 95% confidence interval about the slope of the true least-squares regression line. Lower bound (Round to three decimal places as needed) Upper bound (Round to three decimal places as needed) () What is the estimated mean 28-day strength of this concrete if the 7-day strength is 3000 psl? A good estimate of the mean 23-day strength is si (Round to two decimal places as needed)
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