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Are confidence intervals one-tailed or two-tailed?
TWO-TAILED
ONE-TAILED
2 points  Â
Interpret the meaning of the confidence interval for Treadmills at a 95% confidence level.
95% of people purchased between 24 and 37 contracts after buying treadmills.
We are 95%Â confident that the number of contracts purchased is between 24.3 and 37.2
We are 95%Â confident that customers who purchased contract after purchasing treadmills is approximately between 24% and 37%.
Unable to determine this value given the information provided.
4 points  Â
Interpret the meaning of the confidence interval for Exercise Bikes at a 95% confidence level.
We are 95% confident that the percentage of customers that purchased Exercise Bikes is between 25% and 40%.
We are 95% confident that the percentage of customers that purchased Exercise Bikes is between 25 and 40 contracts.
We are 95% confident that the percentage of customers that purchased Exercise Bikes is more than 50%
Unable to determine this information.
Using the two-proportion confidence interval formula we determine if there is a difference between the two proportions. Is there a difference between the proportions?
Yes
There is no difference because the confidence interval contains zero since the interval is between (-12%Â and 8%)
Unable to determine this information given insufficient evidence.
Yes. The because we are 95% confident that the percentage of customers who -purchase contracts is under 12% and 8%
10 points  Â
Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes. You may want to use this site to check your calculations: http://vassarstats.net/prop2_ind.html
(-12, 8)
(8,12)
(-12%, 8%)
Unable to determine
