ordings A random sample of 33 commercials made since the year 2010 has an average of 28.8 seconds with a standard deviation of 6.6 seconds. What is the margin of error that corresponds to a 90% confidence interval for the average length of all commercials made since 2010? O 1.89 O 1.944 O 1.946 01.943 0 None of the above The correct inter-retation of the confidence interval is that we are 90% confident that the interval contains the length of commercials made since the year 2010. Asimilar study was conducted and found an interval of (19.8, 25.6). Can we claim the average length of all commercials made since 2010 is at least 19.9? 0 Yes 0 No 0 Not enough information to determine this 1 Beyond representative sampling, what assumptions are needed to satisfy the requirements for this problem? 0 X ~ normal and n 2 30 OX ~ binomial, up 2 5 and nq 2 5 O X ~ binomial and at least 5 successes and failures OX ~ normal cm 2 30 'Submit