A. A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation:

	Affiliation
Gender	Democrat	Republican	Other
Male	188	75	35
Female	152	143	20

What proportion of all voters is registered as a Democrat? Make sure your answer is in decimal format.

B. Researcher within the Department of Forest Resources are interested in the number people that bring their pets along while outdoor recreating. For one week during the summer at each state park, undergraduate students count the number of individuals or groups that have one or more pets with them. Their results showed that out of 380 visitors, 57 brought a pet. Find a 90% confidence interval for the true proportion of state park visitors that bring their pets. Report the margin of error for your answer.

C. The interval (-2.4, 3.8) is a 99% confidence interval for a population mean . What is clearly the BEST interpretation?

-The confidence interval has a 99% chance of including

-After computing the interval, the interval has 99% probability of including

-The confidence interval includes unless a 1% sampling error occurred

-We are 99% confident that falls within the interval

D. The standard error estimates the standard deviation of the sampling distribution.

-True

-False

E. With a large enough sample size, the standard error becomes normal.

-True

-False

F. The following summary statistics were derived from a simple random sample:

-Mean=27.3

-Standard deviation=16.2

n=41

Compute an 80% confidence interval for the true population mean. Report the upper limit for your answer.

G. A 90% confidence interval for the true population mean = (42, 66), where n = 51. What is the standard error of the mean?

H. Research architects are interested if skyscrapers made of wood materials are more or less resistant to earthquakes than similar steel structures. They build small-scale models from wood and subject them to various vibration levels to simulate the effect of earthquakes with increasing magnitude. The time to collapse is recorded and averaged over many repeated trial runs, then compared to the standard fail time for steel.

-Ho: = o; Ha: o

-Ho: P = Po; Ha: P Po

-Ho: = o; Ha: > o

-Ho: P = Po; Ha: P > Po

-Ho: = o; Ha: < o

-Ho: P = Po; Ha: P < Po

I. Several local residents have voiced concerns to the Minnesota DNR about possible increased pollutants in Christmas Lake due to intensified farming practices. Researchers within the department decided to compare levels of the contaminant chlorophyll-a in Christmas Lake to the acceptable safe standard.

-Ho: = o; Ha: o

-Ho: P = Po; Ha: P Po

-Ho: = o; Ha: > o

-Ho: P = Po; Ha: P > Po

-Ho: = o; Ha: < o

-Ho: P = Po; Ha: P < Po

J. Large studies have found that roughly 77% of college students use Snapchat on a daily basis. Your freshmen seminar class from several years ago was filled with Carlson students who constantly used Snapchat. You conduct a survey across the entire Carlson School of Management to see if they are excessive users of Snapchat.

-Ho: = o; Ha: o

-Ho: P = Po; Ha: P Po

-Ho: = o; Ha: > o

-Ho: P = Po; Ha: P > Po

-Ho: = o; Ha: < o

-Ho: P = Po; Ha: P < Po

K. The bycatch (catching untargeted fish during fishing operations) can be quite large during shrimp harvesting (approximately 60% of the total catch). A new method is proposed to reduce the bycatch during shrimping operations. The company that invented the new nets boasts the bycatch will be lowered to 40% of the total catch. You decide to investigate.

-Ho: = o; Ha: o

-Ho: P = Po; Ha: P Po

-Ho: = o; Ha: > o

-Ho: P = Po; Ha: P > Po

-Ho: = o; Ha: < o

-Ho: P = Po; Ha: P < Po

L. The proportion of supermarket customers who do not buy store-brand products is to be estimated. Which of the following scenarios would lead to a sampling distribution of the sample proportion with the lowest variability? Choose the best answer.

-Sample 100 customers from those who shop at one store location

-Sample 200 customers from those who shop at the stores citywide

-Sample 200 customers from those who shop at one store location

-Sample 300 customers from those who shop at the stores citywide

M. Compute the p-value for the following hypothesis test(make sure answer is in decimal form):

Ho: p = 0.67

Ha: p 0.67

p.hat = 0.73; n = 145

N. Using data from a large sample from a very large population, you compute a 95% confidence interval = (0.02, 0.22). The corresponding null hypothesis statement Ho: = 0.04 be rejected at = 0.05.

-True

-False

O. Using data from a large sample from a very large population, you compute a 80% confidence interval = (-1.55, -0.10). The corresponding null hypothesis statement Ho: = 0.35 will be rejected at = 0.2.

-True

-False

P. A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation:

	Affiliation
Gender	Democrat	Republican	Other
Male	188	75	35
Female	152	143	20

What proportion of male voters is registered as a Republican? Make sure your answer is in decimal format.

Q. A hypothesis test resulted in a t-value of 0.98 and a p-value of 0.327. What is clearly the BEST interpretation?

-The null hypothesis has a 32.7% chance of being true

-The alternative hypothesis has a 67.3% chance of being true

-The null hypothesis has a 98% chance of being true

-The alternative hypothesis has a 98% chance of being true

-The probability of obtaining a p-value of 0.327 (or something more extreme) is 98%

-The probability of obtaining the t-value of 0.98 (or something more extreme) is 32.7%