2/ Let the Polf fext = then E(X) is 2. 225 (30-x) 225 ③2x815 15 ≤x≤ 30
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- We wish to demonstrate that the average time to graduate from Tulane is affected by the students having taken AP calculus in high school. Specially, we wish to demonstrate that students who have taken AP calculus in high school graduate an average of more than 0.25 years sooner than students who have not taken AP calculus in high school. If we let denote the average time to graduate for students who have not taken AP calculus and denotes the average time to graduate for students who have taken AP calculus, then select the appropriate alternative hypothesis.We wish to demonstrate that the average time to graduate from school is afected by the students who have taken AP calculus in hgh school. Specially, we wish to demonstrate the students who have taken AP calculus in high school graduate an average of more than .25 years sooner than students who have not taken AP calculus in high school. If we let μ1 denote the average time to graduate for students who have not taken AP calculus and μ2 dentoe the average time to graduate for students who have taken AP calculus, what is the apropriate null hypothesisWe wish to demonstrate that the average time to graduate from college is affected by the students having taken AP calculus in high school. Specifically we wish to demonstrate that students who have taken AP calculus in high school gradate an average of at most 0.25 years sooner than students who have not taken AP calculus in high school. If we let μ1 demote the average time to graduate for students who have not taken AP calculus and μ2 denote the average time to graduate for students who have taken AP calculus, then select the appropriate alternative hypothesis: a. μ1-μ2 = 0 b. μ1-μ2-0.25 < 0 c. μ1-μ2-0.25>0 Please explain
- A college graduate is looking for a job. It is believed that the chance of getting a job offer after an interview is 0.2 and every interview is independent of each other. Let X represent the number of interviews needed to get the first job offer, find Var(X).In a study of 48 cases of a certain diseases, it was noted that 17 cases developed complications, a frequency of 35%. a. Within the limits, would you expect the true frequency of complications in such cases to be contained? b. Suppose that you observed 170 complications in 480 cases, within what limit would you expect the true frequency of complication in such cases to be contained? c. How do you explain the difference between a and b?7. How do I calculate the prediction interval? is it 0. 385 + / - (0.0456 x 1.96) ?
- A radio manufacturer believes that the length of life of WPPX model radio is normal with µ=12 years and σ=2.5 years. (a) What percent of the radios will function for more than 16 years? (b) Suppose the company decides to replace 1% of the radios. Find the length of guarantee period.i.e. find X. (c) What percent of the radios that will fail to satisfy the guarantee period of 10 years? , i.e. less than 10 years? (d) If 10% of the radios will function for more than X years, find X.There are 10 students in a cafeteria. If x denoted the number of males, what are the poasible values of XA graduating student keeps applying for jobs until she has three offers. The probability of getting an offer at any trial is 0.48. Suppose she has time for at most six applications. For what minimum value of p can she still have 95% confident of getting three offers within the available time?
- Suppose that we identify 155 women 50 to 54 years of age who have both a mother and a sister with a history of breast cancer. 18 of these women themselves have developed breast cancer at some time in their lives. If we assume that the proportion of breast cancer cases in women whose mothers have had breast cancer is 8%, does having a sister with the disease increase the risk? Find the p-value.A drug manufacturer claims that a drug of its own production is 90% effective in relieving allergies for 8 hours. In a sample of 200 people with allergies, the drug relieved pain in 160 of them. Is the manufacturer's claim true on the level of morale? 1%.Cannot find value of P
