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A professor is interested in how the 500 students in his class will rate today's lecture. He selects the first 20 students on his class list, reads the names at the beginning of the lecture, and asks them to go online to the course Web site and rate the lecture on a scale of 0 to 5. Which of the following is the most important reason why a confidence interval for the mean rating by all his students based on these data is of little use?
A. The number of students selected is small, so the margin of error will be large.
B. Most of the students selected will not respond.
C. The students selected can't be consideed a random sample from the population of all students in the course.
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
What id Steve's grade point average at graduation and what is Steve's median grade point at graduation
your task is to interview a representative sample of attendees to a large concert.the schedule includes 200 live
At a = 0.05, what is the test value?
Costs of Television: Listed below are prices (in dollars) and quality rating scores of rear-projection televisions. All of the televisions have screen sizes of 55 or 56 inches.
What percentage of bottles can we expect to have a volume less than 32 oz?
Make a decision by computing the test statistic and comparing it to the decision rule. What the decision rule means in terms of the question in the problem.
A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service.
What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
Volunteers at a teenage distress center have been assigned based on their skills and expertise. It's assumed that 40% are drug related, 25% sex related, 25% stress, and 10% education. For the study sample of 120 calls per month were categoruzed as fo..
Suppose that A makes a statement, and then D says that C says that B says that A was telling the truth. What is the probability that A was actually telling the truth?
the national mean annual salary for a school administrator is 90000 a year. a school official took a sample of 25
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