Need answers on the following:

1.As part of the 22^nd Annual Survey of the Community in Jefferson County participants were asked to share their level of agreement with 12 statements about statewide issues. For one of these questions 146 of the 491 surveyed adults agreed with the statement.The margin of error for this sample if used to estimate the percent of the entire population that would agree with the posed statement, using 95% confidence, would be:

a.146

b.7.4%

c.4.0%

d.3.4%

2.An educator is concerned with the large range of exam scores from students on a 100-point hourly History exam.Which of the following is the most reasonable value that would be expected for the standard deviation when a group of 50 students takes the exam, and the highest grade earned on the exam among the 50 students is 99, with a lowest grade earned of 41?

a.s = 16

b.s = -16

c.s = 0

d.s = 58

Use the following information for questions 11 and 12.A randomly selected group of n = 20 dogs is each provided unlimited food for a 24-hour period.The variable of interest is x = the # pounds of food consumed by a dog in 24 hours.After data collection, it is determined that the sample mean for the 20 sampled dogs is 3.2 pounds with a sample standard deviation of 1.4 pounds.Another 21^st dog is now measured ... a dog that consumes 9.5 pounds in the 24-hour period.

3.What will be the effect of adding this 21^st dog to the statistics that describe the data set?

a.both the mean and standard deviation will increase.

b.the mean will increase, but the standard deviation will remain unchanged

c.the mean will increase, but the standard deviation will decrease

d.the mean will not change, but the standard deviation will increase

4.The n = 21 data items are used to test the hypothesis that the average unrestricted food consumption of dogs is = 3 pounds, versus the alternative hypothesis that the average unrestricted food consumption of dogs is > 3 pounds.After completing the hypothesis test, the resulting p-value you generate/estimate is p = 2.154; which of the following can be concluded?

a.the average consumption for dogs is significantly greater than 3 pounds per day.

b.the average consumption for dogs is significantly less than 3 pounds per day.

c.the average consumption for dogs is significantly the same as 3 pounds per day.

d.this p-value is impossible, something is wrong.

5.A survey of n = 404 St. Lawrence County adults results with 23% indicating that they work at least partly at home using the Internet.The results for this sample can be generalized with a margin of error of approximately 5% most appropriately to which of the following populations?

a.all Internet users in St. Lawrence County.

b.all adults in the North Country

c. all adults in St. Lawrence County

d.all adults who completed the survey

6.The interval 2s captures approximately the middle 68% of a distribution as long as the shape of the distribution is:

a.skewed to the right

b.skewed to the left

c.normal

d.the shape of the distribution does not matter in this situation

7.Which of the following four statements is true regarding statistics?

a.populations are used to infer about samples

b.samples are used to infer about populations

c.if a random sample is used, then you are guaranteed that your sample statistic will be the same as the population parameter of interest

d.if a random sample is used, then you are guaranteed that your sample statistic will fall within the margin of error of the population parameter of interest

8.Fifty countries are randomly sampled throughout the world and the following two variables are recorded for each country:

x = # cell phones owned per household in that country

y = the average Body Mass Index (BMI, with a higher BMI representing more overweight) among residents of that country

The correlation coefficient for the 50 data points and the result is r = -0.372, p = 0.237.Which of the following interpretations may be concluded?

a.the two variables are significantly correlated and having more cell phones causes a smaller BMI.

b.the two variables are significantly correlated but having more cell phones does not necessarily cause a smaller BMI.

c.the two variables are not significantly correlated and countries with more cell phones have a smaller BMI.

d.the two variables are significantly correlated and having more cell phones causes a larger BMI.

9.The JCC Student Activities leadership is interested in collecting information about the desired student activities among current JCC students who plan to attend Jefferson in the fall.To collect this information, the JCC Student Activities leaders email the students who are currently enrolled in classes for the fall semester.This sampling design is an example of:

a.a simple random sample, each returning JCC student has an equal chance of being selected.

b.collecting a bad sample by not including new students.

c.not truly collecting a sample.

d.a convenience sample which will most likely be biased and over and under represent certain types of JCC students.

10.A multi-mode sampling design is used to collect data from a local community by contacting individuals via telephone and via email.Which of the following is most likely to result in a response rate of approximately 10%?

a.percent of all valid emails sent result in a completed interview

b.percent of all valid phone numbers dialed result in a completed interview

c.percent of all dialed numbers (valid and invalid) result in a completed interview

d.percent of all residents contacted by phone

11.A ² test for independence is conducted to determine a potential association between two categorical variables.The resulting p-value is 0.004; which of the following statements is true?

a.It should be concluded that there is a statistically significant relationship between the variables.

b.It should be concluded that here is not a statistically significant relationship between the variables.

c.A ² test for independence is not an appropriate for this situation.

d.A conclusion cannot be made based on the p-value.

12.The p-value of a test of significance is calculated assuming

a.the alternative hypothesis is true.

b.the null hypothesis is true.

c.the claim being investigated is true

d.a significance level of 0.05.