This is statistics course and I need help with answering those questions. If you don't have much time to provide solutions, that's fine but I need correct answers asap. Thank you
D Question 28 1 pts Researchers want to study the effect of consuming coffee with coconut oil, and if it has any effect on metabolism. Suppose 90 volunteer subjects will be evenly divided into three groups: one group will drink a cup of black coffee, one will drink black coffee with 1 teaspoon of coconut oil, and one group will have a choice of drinking decaffeinated coffee or water. Which of the following is NOT a valid method for reducing bias in this experiment? Single-blinding Least-squares regression Blocking for gender Randomization ReplicationD Question 29 1 pts A student wants to know if students at their high school prefer to take statistics or pre-calculus. They were able to get the following data from the school registrar: Statistics Pre-calculus Total: Freshman Sophomores 2 6 8 Juniors 28 42 70 Seniors 30 21 51 Total: 60 69 129 Upperclassmen are defined as students who are either juniors or seniors. Of the students in the sample who are taking Pre-calculus, what proportion are upper-classmen? O 69 O 63 69 O 21 O 63 129 O 69D Question 30 1 pts A statistician is looking at voter data to help his candidate prepare for an upcoming re-election campaign. The table below shows a breakdown of this candidates voters by educational level attained and age. High School Bachelor's Masters or Total: Degree Ph. D. 18-34 44 64 75 183 35-54 68 79 84 231 55 + 83 86 91 260 Total: 195 229 250 674 What proportion of voters 35 years of age or older have attained a bachelor's degree or higher? 340 491 O 163 231 O 340 674 O 340 479 O 165 491D Question 31 1 pts The following table describes the breakdown of vehicle ownership by type and by gender of driver: Sports Car Trucks Luxury Total Vehicles Males 72 67 36 175 Females 36 71 68 175 Total 108 138 104 350 Which of the following is most likely true? O There is a positive association between being male and driving a luxury vehicle, and a negative association between being female and driving a luxury vehicle. O There is a negative association between being male and driving a luxury vehicle, and a negative association between being female and driving a luxury vehicle. There is a negative association between being male and driving a luxury vehicle, and a positive association between being female and driving a luxury vehicle. There is a positive association between being male and driving a luxury vehicle, and a positive association between being female and driving a luxury vehicle. O There is a negative association between being male and driving a luxury vehicle, but the expected cell count of females driving luxury vehicles matches the observed count.D Question 32 1 pts List the following by size from greatest to least (assume the sample is taken without replacement). Population, sampling frame, sample O Sampling frame, population, sample Sample, sampling frame, population O Population, sample, sampling frame Sample, population, sampling frameD Question 33 1 pts When taking repeated random samples of the same size from the same population, which of the following must be true? O The values of the population mean will vary from sample to sample. O The averages of the sample means will equal the population mean. O The population mean will not be equal to any of the sample means. The samples means may vary from sample to sample. O The population mean can be predicted only when the sample sizes are small.D Question 35 1 pts As part of a promotional, a department store will offer a $500 shopping spree to every 5000th customer. This is most likely an example of what type of sampling: Stratified random sampling Convenience sampling Cluster sampling O Multi-stage sampling O Systematic sampling
