This is statistics course and I need help with answering those questions.

D 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 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 34 1 pts A survey is conducted at a local high school to determine the effectiveness of school communication with students' families who speak a language other than English at home. To collect data, the school's statistician plans to send a questionnaire home with students to ask for the parent's opinion about the school's communication effectiveness. Which of the following sources of bias is apparent in this survey, and what is the best way to reduce bias? O Wording effect bias; parents should be given the opportunity to rate communication on a scale. Non random sampling; questionnaires should only be sent home with a random sample of students. Undercoverage bias; a native speaker of the family's home language should conduct the survey by phone. Nonresponse bias; questionnaires should be mailed to the parent's address rather than sent home with students. O Sampling error; parents are likely to have varying opinions, so some bias is normal and expected