A random sample of 40 commercials made since the year 2010 has an average of 24.9 seconds with a standard deviation of 9.6 seconds. What is the margin of error that corresponds to a 99% confidence interval for the average length of all commercials made since 2010? 4.11 4.1 3.91 4.106 None of the above The correct interpretation of the confidence interval is that we are 99% confident that the interval contains the length of commercials made since the year 2010.A similar study was conducted and found an interval of (21.5, 29.9). Can we claim the average length of all commercials made since 2010 is at least 21.9? Yes No Not enough information to determine this Beyond representative sampling, what assumptions are needed to satisfy the requirements for this problem? �∼binomial and at least 5 successes and failures �∼binomial, NP≥5 and ��≥5 �∼normal orN ≥30 �∼normal and N
A random sample of 40 commercials made since the year 2010 has an average of 24.9 seconds with a standard deviation of 9.6 seconds. What is the margin of error that corresponds to a 99% confidence interval for the average length of all commercials made since 2010?
- 4.11
- 4.1
- 3.91
- 4.106
- None of the above
The correct interpretation of the confidence interval is that we are 99% confident that the interval contains the length of commercials made since the year 2010.
A similar study was conducted and found an interval of (21.5, 29.9). Can we claim the average length of all commercials made since 2010 is at least 21.9?
- Yes
- No
- Not enough information to determine this
Beyond representative sampling, what assumptions are needed to satisfy the requirements for this problem?
- �∼binomial and at least 5 successes and failures
- �∼binomial, NP≥5 and ��≥5
- �∼normal orN ≥30
- �∼normal and N
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