S1/ I swear I get so much junk email! I'm not sure what proportion of re junk emails though. The results of selected 75 emails, classified as "work", "personal", or "junk" are found in the Excel sheet labeled Emails.

Show and label your work on the Excel sheet labeled Emails, and highlight your final answer yellow.

a) What is the point estimate for the proportion of that are junk emails? (Keep 4 or more decimal places)

b) Construct a 95% confidence interval for the proportion of that are junk emails. (Keep 4 or more decimal places)

c) sentence interpreting your confidence interval.

2/ Question 4 SAT

A tutor wishes to know how well their students are doing. In the Excel sheet labeled SAT there are randomly selected SAT scores from 36 students the tutor has worked with.

Show and label your work on the Excel sheet labeled SAT, then highlight your final answer yellow.

a) What is the point estimate for the average SAT score of students who have worked with this tutor? (Keep 4 or more decimal places)

b) Compute a 90% confidence interval for the average SAT score of the students who have worked with this tutor. (Keep 4 or more decimal places)

c) The average score on the SAT in Oregon last year was 550. Based on your 90% confidence interval is there any evidence that on average students who work with this tutor do better than the Oregon average? Provide reasons.

Question 18. In linear probability model, which of the following is FALSE? a) The predicted value of the dependent variable are mostly different from 0 or 1. b) The error term's will differ for when the dependent variable is 0 from when the dependent variable is equal to 1. c) The predicted values can lie above 1 and below 0. d) The t-statistics and the F statistics are valid. e) None of the aboveDescribe the error in the conclusion. Given: There is a linear correlation between the number of cigarettes smoked and the pulse rate. As the number of cigarettes increases the pulse rate increases. Conclusion: Cigarettes cause the pulse rate to increase. Now that you are familiar with the basic concepts of statistics, what are some examples of when you have seen or heard statistics used inappropriately?14. By one convention, Greek letters (u, o. a) are used to characterize a. croncous data. b. statistics. c. inferences. d. Population parameters. 15. The discipline of statistics may be conceptually divided into which of the following categories? a. Descriptive and inferential statistics. b. Finite and infinite statistics. c. Exact and approximate statistics. d. Theoretical and research statistics. 16. The sign of r (+/-) tells you the of the relationship between X and Y. a. direction b. strength c. power d. none of the above 17. The following data looks at hours of sleep versus GPA. Without calculations, what is the direction of the relationship? (You might have to draw.) a Linear, Positive b. Linear, Negative c. No relationship d. Curvilinear 18. The value of r gives you the of the relationship between X and Y. a. direction b. strength c. power d. none of the above 19. The data shown below describe children in four countries in terms of adequate dental care. Adequate Inadequate Dental Care Dental Care UK 2520 180 US 4560 240 France 1100 300 Mexico 2820 280 What is the probability that a child from France has inadequate dental care? a. 300-3100 b. 180/12000 c. 300/1400 d. 1 100/1 1000