QUESTION 9 Which of the following invalidates the Central Limit Theorem? 0 In order to measure the support for a new grading policy among UIC students, a survey is given to a sample of 60 people, but the sample is biased since all 60 students are engineering majors. O In order to study the typical time spent on homework assignments for UIC students, a survey is given to a sample ofonly 10 people at random, but the probability distribution for the time spent on homework can be well approximated as a normal distribution. 0 In order to study the typical commute time to UIC for students, a survey is given to a sample of 60 people at random, but the probability distribution for the commute times of UIC students is known to be strongly asymmetric. O In order to measure student attendance to labratory sections of a large UIC course, a survey is given to a sample of only 35 people at random, but the probability distribution for the lab section attendance is known to be uniform. QUESTION 10 Which of the following describes the sample mean distribution in cases where the population variance is unkown'! O The sample mean statistic has a chi-squared ( 1/2) distribution whenever the population variance is unknown. 0 The sample mean statistic can be transformed to a t-value using the sample variance to approximate the population variance, and the t-statistic has a t-distribution. O The sample mean statistic can be transformed to a z-value, and the z-statistic has the standard normal distribution. O The population variance is required in order to dene the sample mean distribution