Sophia Learning MTH 300 statistics Unit 1 Milestone,100% CORRECT

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1. Mike wants to find the approximate income for professors in Michigan. He decides to randomly select 50 professors who work for a college or university in Michigan and obtain their salaries. What a... re the sample and the population of Mike’s Study? D) The 50 professors that Mike interviews are his sample, and all of the professors who work in Michigan are the population. 2. A pizza owner asked 50 customers to taste a new type of topping and found that 40 people likes its taste. Which of these is an example of descriptive statistics? D). 80% of the surveyed customers like the taste of the pizza topping 3. A travel agency contacted a department store and obtained the list of all the people who made purchases using their credit cards at the store last month. The agency the surveyed a random sample from the list, calling them to as their preference for air travel or train travel for taking holidays. Which of the following types of bias affects the conclusions of the survey? D) Selection bias 4. Choose the statement that accurately describes how a city government could apply systematic random sampling. C) every fifth person in a population is selection to participate in a survey about city services 5. the owner of a pizza parlor called every 5th person who ordered pizza last week to rate the pizza. What type of statistical study is this? C) A Survey 6. The following shows the Consumer Price Index (CPI) for the years 2000-2005. All of the values use a reference year of 1983. Which of the following is true about the CPI, based on the information? A). $100 in 1983 would be equivalent to $178 in 2001 7. Researchers want to study the effects of the classical music and memory. One group of participants will take a memory test with classical music playing in the background, while the other group will take the memory test in complete silence. It is believed that age has an effect on memory. Which of the following would work best to test if classical music has an effect on memory? C) A matched-pair design experiment. 8. A retail brand plans to open its stores across all cities with a population of more than one million. To prepare for this, it refers to the past years census done by the government. Which statement accurately describes the type of data the retail brand is using? D) the census is an example of available data because the government provides it. 9. Jenae’s study ignored the fact that only some of her coffee choices had caffeine, even though her co-workers preferred caffeinated coffee. Therefore, Jenae decided to label one type of decaffeinated coffee as having caffeine to see what would happen. As she anticipated, this coffer became more popular with her co-workers, and they claimed that the extra boost of caffeine helped them focus on their work. The growing popularity of the decaffeinated coffee among co-workers, under the false impression that it gave them extra caffeine, is an example of A) The placebo effect 10. Its Saturday afternoon, and Denise is going shopping. She stops by a department store because she needs a new pair of shoes. She has picked out three styles that she likes. The store associated asks, “What is your shoes size?” Which type of question has the store associate asked? D) Closed question 11. Select the correct statement regarding experiments. A) A researcher can carefully control the explanatory variables and observe human responses. 12. Cindy measured and recorded the temperature of a liquid for an experiment. She used a poorly calibrated thermometer and noted the temperature as 100.5 degrees Fahrenheit. The actual temperature of the liquid was 95 degrees Fahrenheit. The percent error in her calculation is ____________. D) 5.79% 13. The manager of a food company wants to conduct a survey to find out whether consumers like or dislike a new brand of soup that recently launched. Which of the following data collection methods is mostly likely to get unbiased results? B) Ask distributors who supply the products to local retailers about the popularity of different soup brands. 14. In 2007, 4% of people buying new cell phones purchased a Bluetooth earpiece during the same transaction. In 2012, 28% of people buying new cell phones purchased a Bluetooth earpiece during the same transaction. Of the following choices, what is correct about the growth of Bluetooth sales? D) It rose by 24 percentage points. 15. A factory manufactures bolts, one of its employees, working in the quality control department, checks the first 20 bolts manufactured in a day for possible defects. This is what type of sampling? C) Convenience Sampling 16. A Sports trainer is going to do an experiment on the effect of Vitamin D supplements and his athletes. He randomly assigns all of his patients to either take Vitamin D supplements of take a placebo. What type of experimental design does this situation illustrate? D) Completely Randomized 17. A survey conducted among students in the school cafeteria asked a set of questions listed below. Which survey question would produce a qualitative response? A) What is your favorite dish. 18. A local school newspaper’s editor to survey students to determine the approval rating of the current student council president. How would the newspaper apply the cluster sampling method to find this information? B) The newspaper staff surveys every student in a randomly selected grade. 19. A scientist is conducting a study on the effect of eating chocolate and overall mood. They believe that gender is a significant factor. The participants are divided by gender. Then, within each group, participants are randomly assigned to consume either chocolate or a placebo and then rate their mood for the day. This experiment will run for two weeks. Which type of experimental design does this situation describe? D). Randomized Block Design 20. Jenae noticed that many of her co-workers would opt for the coffee that appeared to be most recently brewed, regardless of the flavor of the coffee offered. This leads her to believe that what she was witnessing was not really representative of everyone’s true flavor preferences. She adapted her experimental study accordingly. Select one control in Jenae’s experimental study. C) Jenae makes sure that the coffee in different pots is brewed at the same time. 21. A student group on a college campus wanted to create a survey about parking availability on campus. The student group randomly selected 300 students to take the survey. One the questions read, “Many students believe the lack of available parking is a major problem. Do you agree or disagree?” of the 300 students that took the survey, 285 survey were returned. This survey will most likely suffer from which of the following types of bias? C)Response Bias 22. Which of these random samples represents a representative sample of the number of students who enjoy science class? B- 30 students in the lunchroom 23. A hunter is practicing as his aim using a practice target. He takes 5 shots. All 5 shots hit the target, but they do not hit or surround the bullseye. In addition, all 5 shots are very spread apart on the target. Classify the hunters accuracy and precision. C- Low accuracy and low precision 24. The blood bank at a hospital has 1200 units of blood, out of which 37% units are of blood group B+. A clinical researcher randomly selects 300 units of blood and finds that 33% of those are of blood group B+. to test his result, he randomly selects 200 units of blood and finds that 40% of those ae of blood group B+. Which of the following is the reason there is a difference between the two percentages selected by the researcher? D- Random Error; the numbers were differently due to variability inherent in sampling. 25. In a bolt-manufacturing factory, it is estimated that 6% of the bolts being manufactured will be defective, with a 3% margin of error. Choose the statement that correctly describes the confidence interval. B- The percentage of defective bolts is between 3% and 9%. 26. Which of the following data types will be continuous? D- the amount of snow that fell last night. 27. A team of researchers want to measure the distance covered while driving compared to a cars’ driving speed. Which statement is correct. D- The speed of the car is an explanatory variable. 28. To compare the teaching methodologies of two of its eighth-grade math teachers, a school decides to compare student test scores from the two classes throughout the year. Which type of statistical study is the school conducting? B- Prospective observational study 29. A different coffee seller offered to sell coffee to Jenae’s company for half the cost of their current brand. Jenae knew her co-workers were really partial to the coffee the drank now, so she decided to conduct a study to see if they noticed the difference in flavor. Her co-workers were convinced they would. To avoid any bias, Jenae had a friend provide each person with a sample and said that some had the new coffee and some did not. Not even Jenae knew who had which brand of coffee. Jenae’s Strategy is an example of a(n)________. D- blind experiment [Show More]

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