Page 3 of b8 lem One (10%of the points on this question) A researcher wants to k
ID: 3058576 • Letter: P
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Page 3 of b8 lem One (10%of the points on this question) A researcher wants to know whether a new software system improves worker productivity. She selects a random, representative sample of 50 workers. She measures each worker's productivity before using the software system, and after using the new software system. She stores the data in two different spreadsheets: one contains the 50 workers productivity before using the software system; the other contains the 50 workers' productivity after using the new software system. Do you think that the data contained in the two different spreadsheets are two indspendent random samples? Why? a) b) (20% of the points on this question) A random and representative sample of 200 office workers was gathered. 48% of the workers in the sample had received a flu vaccination. A 95% confidence interval for the proportion of office workers who have received a flu vaccination is 40.9%-55.1%. Is the following statement a correct interpretation of this estimate? Explain why, or why not. "We think that 95% of the time the true proportion of office workers who have received a flu vaccination is 48%" Question one continues on the next pageExplanation / Answer
Page 3 of b8 lem One (10%of the points on this question) A researcher wants to know whether a new software system improves worker productivity. She selects a random, representative sample of 50 workers. She measures each worker's productivity before using the software system, and after using the new software system. She stores the data in two different spreadsheets: one contains the 50 workers productivity before using the software system; the other contains the 50 workers' productivity after using the new software system. Do you think that the data contained in the two different spreadsheets are two indspendent random samples? Why? a) b) (20% of the points on this question) A random and representative sample of 200 office workers was gathered. 48% of the workers in the sample had received a flu vaccination. A 95% confidence interval for the proportion of office workers who have received a flu vaccination is 40.9%-55.1%. Is the following statement a correct interpretation of this estimate? Explain why, or why not. "We think that 95% of the time the true proportion of office workers who have received a flu vaccination is 48%" Question one continues on the next page
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