Worksheet #4 (60) Pts
Name: ______Lab Section: ______
Use the information in the following setting to answer questions 1-6:
A local merchant’s association would like to estimate the average length of time that patrons remain parked at a local parking garage. A SRS of garage users was collected during the summer months and their parking time was recorded (minutes). The descriptive output follows in Output 1.
1) The t-value required to compute a 95% margin of error is: [3 pts]
2) The 95% margin of error is: [5 pts]
3) The point estimate for the true average parking time for all garage users is: [2 pts]
4) The 95% CI for the true average parking time for all garage users is: [5 pts]
5) The English interpretation of this interval is: [5 pts]
6) The underlying assumption for this CI technique is that the data come from a normally distributed population. Figure 1 is a QQ plot for the sample data. Based on this plot discuss the validity of this assumption in two or three sentences. [5 pts]
Use the information in the following setting to answer questions 7-13:
One of the more controversial issues in the biotechnology arena is that of human cloning. Many people have significant concerns regarding others genetically replicating themselves. A recent Gallup poll revealed that, of 1012 randomly selected adults only 91 reported that human cloning was ethically and morally “OK”. Let = 0.01. Do these results provide enough evidence to support a claim that fewer than 12% of the population view human cloning as “OK”?
7) Ho:[3 pts]
Ha:[3 pts]
8) = Test Type: 1 or 2 tails?z-crit =[2 pts each]
9) Draw the decision curve: [5 pts]
10) z-calc = [5 pts]
11) Label z-calc on the decision curve: [3 pts]
12) The statistical decision is: [2 pts]
13) The English interpretation is: [8 pts]
Rick GuminaSTCC201Worksheet4.doc
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