Suppose a small company that manufactures cereal bars own two scales that weigh their products (say A and B). Quality control manager in this company is concerned that scale A is erroneous. He takes a sample of 20 cereal bars and weigh each of them using both scales A and B. Assume that you were given a spread sheet that include weights of the 20 cereal bars reported by two scales. Explain how you would approach testing the QC managers’ concern. What type of tests/CI you would construct to help him make a decision? Mention of any assumptions you would check or any graphing techniques you would use to display the data.

Match the name of the sampling method descriptions given. choosing every 5th person on a list Situations separating all students by grade level, and selecting 10 students from each grade pulling 50 names from a hat randomly select two tables in the cafeteria and survey all the people at those two tables ask all the students in your math class Sampling Method a. Stratified b. Simple Random c. Convenience d. Systematic e. Cluster Submit Question II F3 <40 F4 144 $ F5 114 UP T DELL F6 F7 F8 F9 % olo &

this question below Are there less children diagnosed with Autism Spectrum Disorder (ASD) in states that have larger urban areas over states that are mostly rural? Assume data were collected from a fairly urban state and they found 189 eight-year olds diagnosed with ASD out of 19300 eight-year olds evaluated. D Assume data were then collected for a fairly rural state and they found 70 eight-year olds diagnosed with ASD out of 2841 eight-year olds evaluated. Is there enough evidence to show that the proportion of children diagnosed with ASD in the fairly urban state is lower than the proportion in the fairly rural state? a.) Test at the 4% level b.) Compute a 96% confidence interval for the difference in proportions. Use the following steps for the hypothesis test. For the confidence interval you do not need to do all the steps since you did some of them already in hypothesis test. Part a.) HYPOTHESIS TEST Parameter What is the correct parameter symbol and wording for population 1? P1…

The 2007-2008 financial crisis has been considered the worst financial crisis since the Great Depression of the 1930s. It resulted in the collapses of several large financial institutions and led to great concerns about the stability of global financial systems. Since then, investors’ views regarding the growth of economy have been diverging significantly. Many efforts have been made by the government to ensure investors’ confidence in the economy. The table below summarizes a recent survey on investors’ views of the economy. Investors are categorized according to the size of their assets.   (a) What is the probability that an investor with more than 1 billion dollars asset believes that the economy is getting worse?             (b) What is the probability that an investor who believes the economy is getting better has assets with value more than 100 million dollars?             (c) Consider the event of “economy is getting worse” and the event of “investor with asset value less than…

The following data represent the Sales (in $1000) data gathered from a marketing efficacy study in Week 1 of December 2019 at a fast-food chain.Each row is an individual store that was randomly selected for this study. Sales(In_Thousands) 74.53 65.97 67.1 78.78 39.43 75.75 46.48 47.57 52.6 52.73 54.68 56.79 63.72 64.24 64.78 69.83 73.76 80.22 80.8 90.86 92.05 92.53 64.85 76.88 68.12 Use Excel or Ti calculator to perform a one-sample t test to test the claim that the average sales (in $1000) for all such stores is different from 69 in Week 1 of December at 0.06 significance level. a. The sample mean (rounded to 3 decimal palces) is_____________ b. The sample standard deviation (rounded to 3 decimal palces) is__________ c. The test statistic for this test is (rounded to 4 decimal places)_______________ d. The p-value for this test is (rounded to 4 decimal places)__________________ e. At 0.06 significance level, the correct…

Proctor ents urces ources canvas.pdx.edu/courses/106252/assignments/1102418?module_item_id=4856623 Are there less children diagnosed with Autism Spectrum Disorder (ASD) in states that have larger urban areas over states that are mostly rural? Assume data were collected from a fairly urban state and they found 165 eight-year olds diagnosed with ASD out of 18096 eight-year olds evaluated. Assume data were then collected for a fairly rural state and they found 56 eight-year olds diagnosed with ASD out of 2400 eight-year olds evaluated. Is there enough evidence to show that the proportion of children diagnosed with ASD in the fairly urban state is lower than the proportion in the fairly rural state? a.) Test at the 4% level b.) Compute a 96% confidence interval for the difference in proportions. Use the following steps for the hypothesis test. For the confidence interval you do not need to do all the steps since you did some of them already in hypothesis test. Part a.) HYPOTHESIS TEST…

Quick note for Excel users: Excel analyzes using first variable minus second variable. If need help, watch the video at the bottom. Testing a claim about a population mean: t-Test An overly involved "neighborhood watch" group has been investigating the length of lawns. In years past, lawns had been mowed to a mean length of 2.5 inches. A recent random sample of lawn lengths is given below. Conduct an appropriate test, at a 5% significance level, to determine if the overall mean lawn length is now higher than 2.5 inches. Data (lawn lengths, measured in inches): 2.46 2.64 3.96 4.58 3.34 3.97 3.88 4.22 3.09 3.39 4.53 3.30 2.98 3.10 2.58 3.44 Checksum: 59.34 3.88 Click Download CSV to download csv file of data or copy/paste the data into Excel. After downloading the file, you may want to save it as an Excel Workbook. A. Consider the parameter of interest and choose the correct alternative hypothesis. =2.5 >2.5 Oμ2.5 Ομ 2.5 B. Are the necessary conditions present to carry out this…

4.) A random sample of Print-O-Matic printing company's employee salaries (in dollars) are contained in table #3.1.1. Table # 3.1.11: Salaries of Print-O-Matic Printing Company Employees Employee Salary ($) CEO 272,500 Driver 58,456 CD74 100,702 CD65 57,380 Embellisher 73,877 Folder 65,270 GTO 74,235 Handwork 52,718 Horizon 76,029 ITEK 64,553 Mgmt 108,448 Platens 69,573 Polar 75,526 Pre Press Manager 108,448 Pre Press Manager/ IT 98,837 Pre Press/Graphic Artist 75,311 Designer 90,090 Sales 109,739 Administration 66,346 a.) Find the mean and median. b.) Find the mean and median with the CEO's salary removed. c.) What happened to the mean and median when the CEO's salary was removed? Why? d.) If you were the CEO, who is answering concerns from the union that employees are underpaid, which average of the complete data set would you prefer? Why? e.) If you were a platen worker, who believes that the employees need a raise, which average would you prefer? Why?

3.) The lengths (in kilometers) of a random sample of rivers on the South Island of New Zealand that flow to the Tasman Sea are listed in table #3.1.9 (Lee, 1994). Find the mean, median, and mode. Table #3.1.9: Lengths of Rivers (km) Flowing to Tasman Sea River Length (km) River Length (km) Hollyford 76 Waimea 48 Cascade 64 Motueka 108 Arawhata 68 Takaka 72 Haast 64 Aorere 72 Karangarua 37 Heaphy 35 Cook 32 Karamea 80 Waiho 32 Mokihinui 56 Whataroa 51 Buller 177 Wanganui Waitaha Hokitika 56 Grey 121 40 Taramakau 80 64 Arahura 56