The value of Young's module (GPa) was determined fore cast plates consisting of certain intermetallic substrates resulting in the following sample observations: Q#1 116.4 115.9 114.6 115.2 115.8 Calculate the mean and standard deviation.
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- Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. An article in the ASCE Journal of Energy Engineering ("Overview of Reservoir Release Improvements at 20 TVA Dams," Vol. 125, April 1999. pp. 1-17) presents data on dissolved oxygen concentration from streams below 20 dams in the Tennessee Valley Authority system. The sample mean from the observations is = 3.294 and the sample standard deviation is s = 2.125. Assume population is approximately normally distributed. Round your answers to 2 decimal places. (a) Calculate the 95% two-sided confidence interval on the mean oxygen concentration. | SUSI (b) Calculate the 95% two-sided prediction interval on the dissolved oxygen concentration for the next stream that will be tested. ≤Xn+1 ≤ (c) Find an interval that will contain 95% of the values of the dissolved oxygen concentration with 99% confidence. iIt is claimed that the average household in Thunder Bay uses more than 1170 kWh of electricity each month. To test this claim, you carry out a small survey of 25 households. The survey finds an average consumption of 1225 kWh with a standard deviation of 150. Using an alpha value of .01, what conclusion can be reached?Based on figure, given USL=120mm and LSL=110mm. Draw process on one diagram with proper labels.
- Answer 7 8 9 handwrittenThree industrial engineers were assigned to monitor a certain process using X-control chart with n=9, and K=2. The in-control process mean and standard deviation are 14 and 6, respectively. The probability of having one point below the LCL equals 0.001350. Help in answering the following questions: A- Estimate the ARL. B- Estimate the ATS. C- What is the amount of shift per unit of standard deviation?According to one study, brain weights of men are normally distributed with a mean of 1.50 kg and a standard deviation of 0.15 kq. Use the data to answer parts (a) through (e) d. Determine the percentage of all samples of three men that have mean brain weights within 0.1 kg of the population mean brain weight of 1.50 kg. Interpret your answer in terms of sampling error. (Round to two decimal places as needed.)
- A survey found that women's heights are normally distributed with mean 62.4 in. and standard deviation 2.9 in. The survey also found that men's heights are normally distributed with mean 67.5 in. and standard deviation 3.1 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 56 in. and a maximum of 64 in. Complete parts (a) and (b) below. a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park? The percentage of men who meet the height requirement is nothing%. (Round to two decimal places as needed.) Since most men ▼ do not meet meet the height requirement, it is likely that most of the characters are ▼ b. If the height requirements are changed to exclude only the tallest 50% of men and the shortest 5% of men, what are the new height requirements? The new height requirements are a…2. According to the National Association of Home Builders, the average cost of building a home in the Northeast is $ 117.91 per square foot. A random sample of 36 new homes indicated that the mean cost was $122.57 and the standard deviation was $20. Can it be concluded that the mean cost differs from SI17.91, using 0.10 level of significance? i. Ho: Ha: ii. Do a -test at a= iii.Decision Rule: Reject Ho if iv.ComputationsConsider the following hypolhesis test: Ho : µ > 240 H. : µ < 240 A sample of 60 provided a sample mean of 234 and a sample standard deviation of 25. Find the value of the test statistic. Select one: O a. t = -1.86 Ob.t = -0.24 O c.t = -2.32 O d. t -0.30
- The slant shear test is widely accepted for evaluating the bond of resinous repair materials to concrete; it utilizes cylinder specimens made of two identical halves bonded at 30°. An article reported that for 12 specimens prepared using wire-brushing, the sample mean shear strength (N/mm2) and sample standard deviation were 18.60 and 1.56, respectively, whereas for 12 hand-chiseled specimens, the corresponding values were 23.19 and 4.07. Does the true average strength appear to be different for the two methods of surface preparation? State and test the relevant hypotheses using a significance level of 0.05. (Use ?1 for wire-brushing and ?2 for hand-chiseling.) H0: ?1 − ?2 = 0Ha: ?1 − ?2 ≤ 0H0: ?1 − ?2 = 0Ha: ?1 − ?2 < 0 H0: ?1 − ?2 = 0Ha: ?1 − ?2 > 0H0: ?1 − ?2 = 0Ha: ?1 − ?2 ≠ 0 Calculate the test statistic and determine the P-value. (Round your test statistic to one decimal place and your P-value to three decimal places.) t = P-value = You may have computed…Acrylic bone cement is sometimes used in hip and knee replacements to fix an artificial joint in place. The force required to break an acrylic bone cement bond was measured for eight specimens under specified conditions, and the resulting mean and standard deviation were 306.11 newtons and 41.94 newtons, respectively. Assuming that it is reasonable to believe that breaking force under these conditions has a distribution that is approximately normal, estimate the mean breaking force for acrylic bone cement under the specified conditions using a 95% confidence interval. (Use a table or technology. Round your answers to three decimal places.) n USE SALTOnly need help with finding tcalc.
