A 90% confidence interval for the mean time it takes to run 1 mile for all high school track athletes is computed from a simple random sample of 200 track athletes and is found to be 6.2 ± 0.8 minutes. We may conclude that:
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✔ true proportion of adults whoproportion of adults who said theysample of those who report they
After interviewing 1,200 people, a Gallup Poll reports with 95% confidence that 23% of adults exercise at least 3 times a week with a margin of error of 6%. Interpret the confidence level in the context of the scenario. If we were to select many random samples of from the same population and construct a 95% confidence interval using each sample, about % of the intervals would capture the exercise.
The state government claims that the average earnings for a high school student who works during the summer is $1,500. A survey of 200 local high school students determined that the average amount of money earned at a summer job in the area was $1,100 and a 90% confidence interval was found to be ($975, $1,225). The confidence level is interpreted to mean that:
One hundred tomato plants were randomly selected from a large garden, and a 90% confidence interval was computed to determine the true proportion of plants that produce useable tomatoes. The interval is 0.86 to 0.92.What would happen to the width of the confidence interval if the sample size was quadrupled?
One hundred tomato plants were randomly selected from a large garden, and a 90% confidence interval was computed to determine the true proportion of plants that produce useable tomatoes. The interval is 0.86 to 0.92.What would happen to the width of the confidence interval if the confidence level increased to 95%?
What can be done to decrease the margin of error? Check all that apply.
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A survey was sent via email to a sample of 200 students at a local school to see what percentage of the students would like to switch to wearing uniforms. Of the 200 students at the school, only 15 replied to the survey. A margin of error of 6% was calculated. Which of the following biases is present in this data collection method that cannot be accounted for through margin of error?
What biases are present that cannot be accounted for through margin of error? Check all that apply.
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