A fabric manufacturer employs a control chart to monitor stained fabric rolls in their production runs. The results of their process were inspected for 20 days taking the day's production as a sample, giving the results shown in the table below: (Image attached) Use this data to construct a control chart for stained rolls of fabric. Is the process under control? What limits would you recommend to control future production? Do not us

A fabric manufacturer employs a control chart to monitor stained fabric rolls in their production runs. The results of their process were inspected for 20 days taking the day's production as a sample, giving the results shown in the table below: (Image attached) Use this data to construct a control chart for stained rolls of fabric. Is the process under control? What limits would you recommend to control future production? Do not us

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Doctors are interested in the relationship between the dosage of a medicine and the time required for a patient's recovery. Table 2 shows, for a sample of 10 patients, dosage levels (in grams) and recovery times (in hours). These patients have similar characteristics except for medicine dosages. Table 2: Dosage Level and Recovery Time Patient Dosage Level Recovery Time 1 1.2 25 2 1.3 28 3 1.0 40 4 1.4 38 1.5 10 6. 1.8 9. 7 1.2 27 8. 1.3 30 9. 1.4 16 10 1.3 18 a. Estimate the linear regression of recovery time on dosage level. b. Compute R2 and interpret it. c. Perform an F test of goodness of fit at the 5% significance level.
please help me with a. Answer there is incorrect
A study was done to assess the ash content in peat moss used for textile fiber. High ash content affects the quality of the textile. The following data are measurements of the percentage of ash by weight. 0.5 1.8 4.0 1.0 2.0 1.1 1.6 2.3 3.5 2.2 2.0 3.8 3.0 2.3 1.8 3.6 2.4 0.8 3.4 1.4 1.9 2.3 1.2 1.9 2.3 2.6 3.1 2.5 1.7 5.0 1.3 3.0 2.7 1.2 1.5 3.2 2.4 2.5 1.9 3.1 2.4 2.8 2.7 4.5 2.1 1.5 0.7 3.7 1.8 1.7 We know that the data are somewhat skewed. Does this affect the accuracy of the conclusions in 99% confidence interval and hypothesis that the mean is less than 2.70(α = 0.01)? Hint: think about the sample size.
Video A process sampled 20 times with a sample of size 7 resulted in x = 25.5 and R = 1.7. Compute the upper and lower control limits for the x and R charts for this process. Round %3D your answers to two decimal places. Use Table 19.3. R Chart: UCL LCL I Chart: UCL LCL
Background: To prevent crashes caused by running red lights, many states are installing cameras at dangerous intersections. These cameras are used to take photographs of the license plates of vehicles that run a red light. The Virginia Department of Transportation (VDOT) obtained data on the number of crashes per year caused by running a red light at 13 intersections in Fairfax County, Virginia. Source: Virginia Transportation Research Council, "Research Report: The Impact of Red Light Cameras (Photo-Red Enforcement) on Crashes in Virginia", June 2007 Directions: Perform an appropriate significance test to determine whether or not the reduction in the number of crashes was statistically significant. 1. Click on the Data button below to display the data. Copy the data into a statistical software package and click the Data button a second time to hide it. Data Before After 3.7 1.26 0.1 0 4.55 1.69 2.4 1.94 2.09 3.24 2.5 2.72 0.83 0.24 3.05 1.67 3.21 0.33 1.08 0.18 1.25 0.99 7.25 5.02 191…
Please answer all sub-parts A doctor wanted to determine whether there is a relation between a male’s age and his HDL (so-called good cholesterol). He randomly selected 9 of his patients and determined their HDL cholesterol. The data is reported in the table below: Age (Yrs) HDL (?μmol/L) 38 57 42 54 46 34 32 56 55 35 52 40 61 42 61 38 26 47 a) Compute the regression equation for HDL as a function of age. b)Interpret the meaning of the regression parameters. c) Compute r and r2. Interpret these statistics. d) What is your opinion of the usefulness of using age as a predictor of HDL?
What are percentiles useful for a. showing frequency b.comparing values c. showing concentration
Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of plantings of trees, shrubs, and so on to be used for the project. For cost-estimating purposes, managers use two hours of labor time for the plant- ing of a medium-sized tree. Actual times from a sample of 10 plantings during the past month follow (times in hours).2.1 2.2 1.7 1.6 2.3 3.1 1.5 2.6 2.4 2.2 With a .05 level of significance, test to see whether the mean tree-planting time differs from two hours. a. State the null and alternative hypotheses. b. Compute the sample mean. c. Compute the sample standard deviation. d. What is the p-value? e. What is your conclusion?
You have been hired to measure the concentration of ammonia in water from wells at two districts on Long Island. After sampling 10 wells in one of the districts you find the values are, in mg/L: 6.4, 2.1, 1.4, 0.7, 6.8, 3.2, 2.7, 1.6, 4.9, 1.2. Your assistant plots the data from the second set of wells and the histogram of data from that sample looks pretty much the same as for your data set. Which statistical test do you anticipate that you will use? An one-sample t-test An unpaired, two-sample t-test A paired, two-sample t-test A one-way anova A Mann-Whitney U test Main Content
Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last five samples are shown in the table. Calculate control limits for a chart that will monitor process consistency. The correct control limits as (LCL,UCL) are: Unit # 1 2 3 4 5 (A) (0.00,6.03). B) (-5.37,5.37). (0.00,5.37). (0.00,6.12). Sample 1 73.5 71.3 70.0 71.1 70.8 Sample 2 70.8 71.0 72.6 70.6 70.7 Sample 3 72.2 73.1 71.9 70.3 70.7 Sample 4 73.6 72.7 72.4 74.2 73.5 Sample 5 71.0 72.2 73.3 73.6 71.1
To determine if their 13 oz filling machine is properly adjusted, Smith Paints has decided to use an X-Chart which uses the range to estimate the variability in the sample. J. Step 1 of 7: What is the Center Line of the control chart? Round your answer to three decimal places. Period 1 2 day Select the Copy Table button to copy all values. To select an entire row or column, either click on the row or column header or use the Shift and arrow keys. To find the average of the selected cells, select the Average Values button. Copy Table Average Values The average of the selected cell(s) is 12.970. Copy Value 3 4 5 6 7 Table Control Chart 8 9 10 11 obs5 obs6 Sample Mean Sample Range 13.02 13.0050 12.97 12.98 13.04 13.04 13.01 13.01 13.03 12.95 12.96 13.05 12.98 12.9967 obs1 obs2 obs3 obs4 13.01 13.01 12.98 13.05 13.02 12.98 12.99 12.97 12.9983 12.98 13.01 13.02 12.96 13.03 13.04 13.0067 13.04 13.04 13.02 13.03 13.02 13.04 13.0317 12.99 12.96 13.03 12.95 12.97 13.05 12.9917 12.98 12.96 12.99…
The table available below shows the drive-through service times in seconds for lunches at a fast food restaurant use the data to construct a histogram begin with the lower class limit of 70 seconds and use a class weight of 70 seconds does the histogram appear to be skewed if so identify the type of skewness.