Given that r = 0.62, test the hypothesis that p = 0, using a = 0.01. O Reject Ho. O Do not reject Ho- Find a 99% confidence interval for p. ind your answers to two decimal places (e.g. 98.76). i Based on the confidence interval in part (b), can you conclude that p = 0.5 at the 0.01 level of significance? O No
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- A study was carried out to compare the mean compressive strength of two types of concrete. 10 samples of each type of concrete were collected. Data (in psi) are presented in the next table. (The data table is in the picture) Assuming normality, determine a 95% confidence interval for the difference of the stockings and interpret it. Note: Solve what is requested step by step in order to arrive at the answer, do not skip steps.b) The Distance driven by the female students in two years corresponds to a DC = 96% with a Sample Size(n) = 121, X-bar =10,356mi, & a Stand. Dev. (σ) = 2802mi. Find the Confidence Interval(C.I).We want to estimate the number of pounds of ground beef produced during a month. The firm processes 25,000 cows every year in this plant, and samples 500 cows for this investigation. This sample produced i = 290 lbs ground of beef per cow with a sample standard deviation of s = 40 lbs. The plant is paid S.75/b for the beef. a) Find a 90% confidence interval for ground beef. The plant manager bragged about the productivity of his workers and gave them a bonus because he says they slaughtered 2,500 cows and made $560,000 for the plant this month. Should the board of directors investigate? Why or why not? b) Type here to search 8. 9. E R T Y D F G K L ent pause V B M alt ctri
- Construct a 90% confidence interval for u, - Ho with the sample statistics for mean cholesterol content of a hamburger from two fast food chains and confidence interval construction formula below. Assume the populations are approximately normal with unequal variances. Stats X = 122 mg, s, = 3.72 mg, n, = 12 X2 = 51 mg, s, =2.17 mg, n2 = 14 %3D %3D Confidence interval when (X1 – X2) -t variances are not equalLet us suppose we have data on the absorbency of paper towels that were produced by two different manufacturing processes. From process 1, the sample size was 10 and had a mean and standard deviation of 180 and 15, respectively. From process 2, the sample size was 4 with a mean and standard deviation of 360 and 50, respectively. X Your answer is incorrect. Find a 95% confidence interval on the difference in the towels' mean absorbency produced by the two processes. Assume the standard deviations are estimated from the data. Round your answers to two decimal places (e.g. 98.76).In an experiment on tensile adhesion, a sample of size 22 was taken. The mean load at specimen failure for this sample was 11.8 megapascals and standard deviation was 2.78 megapascals. If the population is known to be approximately nomal, what is a 95% confidence interval on the population mean? O a. Background conditions are not satisfied, the problem cannot be solved Ob.(10.57, 13.03) Oc (11.73, 14.32) Od. (9.77. 11.01)The SPSS output below shows the relation between quadriceps force and potential injury score. If a person obtains a force of 60 for the quadriceps, what would be the predicted injury value be? Calculate the 95% confidence interval around that value. Use a z value of ±1.96 in calculating the confidence interval. R Model 1 Model 1 a. Predictors: (Constant), quadriceps Model Summary .852a R Square .726 Adjusted R Square (Constant) quadriceps a. Dependent Variable: injury .722 Unstandardized Coefficients B Std. Error 154.424 .333 Coefficientsª Std. Error of the Estimate 1.101 .024 2.067 Standardized Coefficients Beta .852 t 140.220 13.905 Sig. <.001 <.001Based on a large sample of capacitors of a certain type, a 95% confidence interval for the mean capacitance, in �й, was computed to be (0.213,0.241). Find a 90% confidence interval for the mean capacitance of this type of capacitor.An article gave the following summary data on shear strength (kip) for a sample of 3/8-in. anchor bolts: n = 60, x = 4.50, s = 1.90. Calculate a lower confidence bound using a confidence level of 90% for true average shear strength. (Round your answer to two decimal places.)We want to estimate the number of pounds of ground beef produced during a month. The fIrm processes 25,000 cows every year in this plant, and samples 500 cows for this investigation. This sample produced x = 290 lbs ground of beef per cow with a sample standard deviation of s = 40 lbs. The plant is paid $.75/lb for the beef. a) Find a 90% confidence interval for ground beef. The plant manager bragged about the productivity of his workers and gave them a bonus b) because he says they slaughtered 2,500 cows and made $560,000 for the plant this month. Should the board of directors investigate? Why or why not?Regression methods were used to analyze the data from a study investigating the relationship between roadway surface temperature x₁ = 1478, (x) and pavement deflection (y). Summary quantities were n = 20, Σy; = 12.75, Σy² = 8.86, Σx, Σ x = 143215.8, and Σxy. = 1083.67. Yi Find a 90.0% confidence interval on each of the following: (a) Slope. [i (b) Intercept. [i i i (c) Mean deflection when temperature x = 75 °F. [i i ] (Round your answers to 5 decimal places.) i ] (Round your answers to 3 decimal places.) (d) Find a 90.0% prediction interval on pavement deflection when the temperature is 75 °F. ] (Round your answers to 3 decimal places.) ] (Round your answers to 3 decimal places.)A researcher has obtained the following scatter plot depicting the relationship between Y and X. On the graph, you can see three possible regression lines, which have a common y-intercept of bo = 35.48. Lines A, B and C cross the y-axis at coordinates (52, 106.78), (52, 66.52) and (52, 36.67), respectively. Given the confidence interval is (0.333, 1.122), choose the correct answer(s). rise Hint: Calculate slope of each line using known formula slope = run 35.48 0 Line A Line B Line C O O O 60 X 8 00 52 106.78 66.52 36.67 Select one or more: ✔a. The slope of Line A is within the confidence interval. ✓b. The slope of Line B is within the confidence interval. ✓ C. 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