this is statistics course and I need help with answering these questions. Thank you

D Question 24 1 pts Callers to a technical support hotline are prompted to conduct a short survey after their support phone call to determine if and how the customer's problem was solved, and to what degree they are satisfied with the service. This survey is primarily used to improve the customer service experience. However, because the customer can hang up at any time, the type of bias in this survey is: O Judgmental sampling O Volunteer samples Nonresponse bias Nonrandom sampling Response BiasD Question 23 1 pts The average internet connection speed in residential buildings across the U.S. is 12.6 Mbps. A group of computer engineering students email out a survey to over 500 residential Internet service subscribers, and ask them to provide a screenshot of their test speed. After calculating the mean connection speed of the 220 people who responded to the survey, they find the sample average is actually 11.9 Mbps. Based on the information presented, which of the following is NOT a possible explanation for the difference between the population and sample means? O Time of day of the speed test has a large confounding effect and was not controlled for. There will likely be undercoverage bias because Internet speeds in commercial buildings were not collected. The difference between the sample and population mean is likely a result of normal sampling error. O The study did not proportionally stratify the results of the survey by the cost of Internet service. The study did not proportionally stratify the results of the survey by rural, suburban and urban responders.D Question 22 1 pts A graduate student wants to research people's perceptions to a recent Senate bill proposing new gun control measures. She decides to poll every fifth person exiting a gun range in her town, and asks them questions such as "Do you think current gun control measures keep people safe?" and "Do you think every person, regardless of their history, should be able to own a gun?" Which of the following statements about the study is true? O Her results are likely to be valid, because she used systematic sampling. Her results are likely to be invalid, due to nonresponse bias. Her results are likely to be invalid, due to response bias. Her results are likely to be invalid, because of incorrect sampling frame. O Her results are likely to be valid, because it is a simple random sample