The following 3× 3contingency table contains observed 2. frequencies for a sample of 240. Column Variable Row Variable A 30 20 30 10 20 60 25 15 30

Proposed regression line: y ̂=5.4+(2.6)x n=4 Sum of squared deviations: ∑(??−?ℎ???)2∑(yi−yhati)2 = 25.2 Sums of squares: ∑(??−????????)2∑(yi−averagey)2 = 59 ∑?2?−?(????????)2∑xi2−n(averagex)2 = 5 Questions: (Enter answers rounded to one decimal place. If appropriate, include a zero before the decimal point) 1. What is ???Syx? 2. What is ??1Sb1? 3. What is SST?   4. What is SSE?   5. What is ?2R2?

esc DATAfile: Business Travel (a) 66°F Mostly sunny ? Current Year You may need to use the appropriate technology to answer this question. The Global Business Travel Association reported the domestic airfare (in dollars) for business travel for the current year and the previous year. Below is a sample of 12 flights with their domestic airfares shown for both years. 345 526 420 216 285 405 635 710 605 517 570 610 2 Ho: H0 Ha: μ = 0 Hod=0 HO Previous Year 315 463 462 206 275 432 585 650 545 547 Formulate the hypotheses and test for a significant increase in the mean domestic airfare for business travel for the one-year period. Ho: Maso Ha: Ho # 508 580 3 $ 4 C f5 % 5 11 f6 T 4- 6 ♫+ & 104 Toldys 7 fg 144 fg savet 10 00 hp DII ✔ Ge f10 DDI 0 ...OCE a Dece* 12. insert P 4 prt sc *** ** CEN ELE L+ TUES delete backspace { home num lock end D 7 home 5:39 PM 10/9/2022 pg up سلام و pg dn ng up

Using the attached images create hypotheses and write a conclusion (use a=0.05).

Q You may need to use the appropriate appendix table or technology to answer this question. Last year, 50% of business owners gave a holiday gift to their employees. A survey of business owners conducted this year indicates that 35% plan to provide a holiday gift to their employees. Suppose the survey results are based on a sample of 60 business owners. (a) How many business owners in the survey plan to provide a holiday gift to their employees this year? business owners (b) Suppose the business owners in the sample did as they plan. Compute the p-value for a hypothesis test that can be used to determine if the proportion of business owners providing holiday gifts has decreased from last year. Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value = (c) Using a 0.05 level of significance, would you conclude that the proportion of business owners providing gifts decreased? Reject Ho. There is…

Q30

use top paragraph to help with 18.

t-test 5. At a local university, English instructors are supposed to grade essays in a class so that the average is exactly 75 points. When 22 random essays were drawn from a large English lecture, the average grade given was 79.1, with s = 6.5. Can we say that this professor is not grading according to the 75 point standard? 6. A marketing company wants to find the average age of employees within a large computer firm. They believe that the average age is 27 years old. After sampling 13 people, they report the following ages: 23 25 31 42 27 35 38 22 28 40 19 26 29 Can they say that their claim is correct? (Use a = .01)

The next four questions (29 to 32) refer to the following: To most Canadians, earthquakes are viewed as rare occurrences, but they are actually quite common. In just one month in 2001, Natural Resources Canada recorded 215 earthquakes that affected Canada from B.C. to Nunavut to Newfoundland. We would like to determine whether there is a linear relationship between the location of an earth- quake X (measured in degrees latitude north of the equator) and the magnitude of the earthquake Y (measured on the Richter scale). The explanatory and response variables are measured for a sample of 13 earthquakes. The equation of the least squares regression line is ŷ = -3.05+ 0.10x. The ANOVA table is showm below: ге Source of Variation df Sum of Squares Mean Square F Regression Error Total 1.40 25.10

Copy of Suppose the relationship between Y and X is given by: Y = 1,788,302 + 160.87*X + error  By how much does the expected value of Y change if X increases by 1 units?