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- 27. Place (click and drag) the description of the study design to the type of study being conducted. Does a certain multivitamin help people lose weight? Researchers randomly select 100 people to participate in the study. Half of them are given the multivitamin. Half of them are given a fake pill. The weights of all of them are recorded daily for the next three months. How do business customers feel about the level of support they receive? The business randomly selects 200 customers and asks them to share their opinions. Do truck drivers get into more accidents than people who drive SUVS? Researchers use police records of automobile accidents over the past year and vehicle registrations to compare the percentage of drivers of vehicles of each type that get into accidents. Survey Observational Study Experimental Study31.76 Peace Corps Volunteers. The Peace Corps is an indepen- dent U.S. government agency that provides trained volunteers for countries requesting assistance. According to Peacecorps.org, as of September 2012, volunteers currently serve in about 76 different host countries. The average age of a volunteer is about 28 years old. The following table reports the percentage of total volunteers serving by geographic region. Percent of volunteers Region Africa 43% Latin America 21% Eastern Europe/Central Asia 15% Asia 10% Caribbean 4% North Africa/Middle East 4% Pacific Islands 3% a. Use the table to design a procedure for obtaining a stratified sam- ple (with proportional allocation) of 50 Peace Corps volunteers. b. If stratified random sampling with proportional allocation is used to select the sample of 50 Peace Corps volunteers, how many would be selected from the Caribbean?
- An assembly line consists of 26 tasks grouped into 7 workstations. The sum of the 26 task times is 153 minutes. The largest assigned cycle time is 24 minutes. The efficiency of this line is O A. 85.00%. O B. 91.07% O C. 52.46% O D. 3.43% O E. 6.38%A fragile product will be transported by road or rail. Since the railway is cheaper, this transportation route will be preferred if the breakage rate is less than 5% in the railway. In the table below, the amount of products transported by both ways and the transportationThe number of broken ones is given. Accordingly, which transportation route should be preferred at the 5% significance level?If 30 participants each completed a memory task three times — once each after having no, moderate, or high levels of caffeine, calculate the total degrees of freedom.
- A local health department believes that a store is merchandising its cereal aisle in a way that puts sugary cereal brands at eye level for children. The store claims that it is not considering sugar content and is stocking the shelves based on other factors. An inspector visited the store and recorded the sugar content per serving listed on the boxes (sugar content for each box is listed under the shelf where that box of cereal is located). Shelf 1 Shelf 2 Shelf 3 Shelf 4 7 13 6 10 8. 5 14 7 8 11 11 10 11 3 a) What are the treatment groups, and how many experimental units are there per treatment? b) If instead of using the content listed on the box, the inspector sampled from multiple boxes of each brand of cereal and tested them for sugar content. How many experimental units were there be if there were 10 boxes per brand on the shelf? Explain your answer. [hint: all the boxes for each brand will be in one place] c) State the null hypothesis and create an ANOVA table based on sugar…An interdepartmental task force is being formed to investigate an increase in violent crimes. 1/5 of the task force will be police officers from the local precinct. 1/4 will be ATF agents, and the remaining 22 will be from the FBI. How many people are participating in the task force?Refer to Exercise 3. In the last 50 samples, there were a total of 622 defective items. The largest number of defectives in any sample was 24, while the smallest number was 6. Is this enough information to determine whether the process was out of control at any time during the last 50 samples? If so, state whether or not the process was out of control. If not, state what additional information would be required to make the determination.