Recently, commuters in Minneapolis have protested on social media, saying commuting time has increased due to a number of badlydesigned construction projects on main roads into and out of the city. A random sample of 72 commuters revealed an average commuting time of 46.8 minutes with a standard deviation of 6.90 minutes.
If you were to calculate a 95% confidence interval, what value would you use for the critical value t*?
Question 12 options:
1.645 

1.993 

1.994 

1.96 
Question 13 (1 point)
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Recently, commuters in Minneapolis have protested on social media, saying commuting time has increased due to a number of badlydesigned construction projects on main roads into and out of the city. A random sample of 72 commuters revealed an average commuting time of 46.8 minutes with a standard deviation of 6.90 minutes.
Calculate a 95% confidence interval for the true mean commute time for Minneapolis commuters.
Question 13 options:
45.25 to 48.35 

45.18 to 48.42 

44.98 to 48.78 

44.55 to 49.03 
Question 14 (1 point)
Recently, commuters in Minneapolis have protested on social media, saying commuting time has increased due to a number of badlydesigned construction projects on main roads into and out of the city. A random sample of 72 commuters revealed an average commuting time of 46.8 minutes with a standard deviation of 6.90 minutes.
What would be a 99% confidence interval for the true mean commute time for Minneapolis commuters? (Hint: you'll have to find a new number to use for the critical value using the StatKey applet)
Question 14 options:
(44.85, 48.75) 

(44.75, 48.85) 

(44.65, 48.95) 

(44.55, 49.05) 
We need to construct the 95% confidence interval for the population mean \muμ. The following information is provided:
Sample Mean  46.8 
Population Standard Deviation  6.9 
Sample Size  72 
The critical value for α=0.05 is z_c =1.96. The corresponding confidence interval is computed as shown below:
CI=(45.18, 48.42)
We need to construct the 99% confidence interval for the population mean \muμ. The following information is provided:
The critical value for α=0.05 is z_c =1.96. The corresponding confidence interval is computed as shown below: 

CI = (44.75,48.85)
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