3. Discuss the basic procedure in making inferences on two samples and give a situation where you can apply it.
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- 29. The General Social Survey polled 1280 men and 1531 women to determine their level of education. The results are presented in the following table. Can you conclude that education level is independent of gender? Use ? = 0.01 level of significance. No High School Diploma High School Diploma Associate’s Degree Bachelor’s Degree Graduate Degree Men 178 608 96 248 150 Women 186 827 128 259 131 (a) State the hypotheses. (b) State the test statistic. (c) Calculate the P-value. (d) Make a decision. (e) State the conclusion addressing the original claim.You are management for a chain of department stores. Your analytics team believes that the proportion of months with lost sales for one of your department stores is 25%. You believe it is higher than this, so you gather some data for the last 4 years. You find that for 48 months there were 17 months where there were lost sales. Do you have enough evidence to doubt your analytics team? a) What is the null hypothesis? b) What is the alternative hypothesis? c) What is the claimed population proportion? d) What is the sample proportion (called the test statistic) e) What is the std deviation f) What is the z-value of the test statistic? g) What is the p-value h) What is the conclusion in words3. please use a .05 significance level for all the problems. Show all your work.When you perform a test, you should at least tell me what your hypothesis is, the teststatistic and your conclusions based on your calculations. Two dice are rolled. A = “sum of two dice equals 3”;B = “sum of two dice equals 7”; C = “at least one dice shows a 1”.1. What is P(A|C)?2. What is P(B|C)?3. Are A and C independent? How about B and C?
- Health researchers wish to compare the efficacy of the Moderna vs. Pfizer Vaccine. Here are 4 possible reasons that it would not make sense to run a matched pair experiment for such a study. Pick the TWO that are correct. 1: You would not be able to find twins willing to be part of such an experiment 2: You could not get two large independent samples for the purposes of comparison. 3: It would be hard to match two people for this test, since researchers do not yet understand what individual factors contribute to the variation of immunity to this disease. 4: It would make no sense to test both vaccines on one person and compare the outcomes. The two that are correct are: Oa. 1 and 4 The two that are correct are: 1 and 3 Ob. The two that are correct are: O c. 1 and 4 The two that are correct are: O d. 2 and 3 The two that are correct are: 3 and 4 O e.4. Researchers believe that men are more physically aggressive than women. To test this, researchers ask 20 participants (10 male, 10 female) to rate how aggressive they are on a scale from 1 to 10. Their scores are listed below. Conduct all six steps of hypothesis testing (use p=.05). Be sure to label all six steps. Also, include a concluding statement (which should include the effect size). Males Females 9 1 8 3 9 5 7 2 8 4 6 3 5 2 9 5 7 4 8 3 M 7.6 3.2 s 1.35 1.32I am to do a project for an inferential statistics class and I would like some basic guidance. I am to propose a research question. My proposed research question is "Does drinking stimulants such as coffee improve a student's grades?" My question is what type of hypothesis test should I use. My options are (Test of Association hypothesis test), (Goodness of Fit hypothesis test), (Two sample hypothesis test for means), and a(Two sample hypothesis test for proportions). My guess is it would be a (Two sample hypothesis test for proportions)? The only other potential category I could see it falling in is (Test of Association hypothesis test).
- Do sit down restaurant franchises and fast food franchises differ significantly in stock price? Specifically, is the average stock price for sit-down restaurants different from the average stock price for fast food restaurants? If sit down restaurants are considered group 1 and fast food restaurants are group 2, what are the hypotheses of this scenario?2. In a population it is estimated that 20% have a desired trait of interest for the researcher. The researcher wants to know how many people on average he has to draw from a population to get 2 people with the trait. Use rows 20-24 of the Random Number Table to carry out the simulation. Explain clearly how you set up the problem and report your findings. Answer:What’s the proportion
- 30. A researcher had originally planned to collect a sample of size 200, and conduct a hypothesis test with a 5% significance level. Now, she has decided instead to collect a sample of size 300, and conduct a hypothesis test with a 1% significance level. How will this change affect the A probabilities of type I and type 2 error? The probability of type 1 error will decrease, and the probability of type 2 error will increase. The probability of both type 1 and type 2 error will decrease. The probability of type 1 error will decrease, but it's impossible to determine whether the probability of type 2 error will increase or decrease. The probability of type 1 error will increase, and the probability of type 2 error will decrease. The probability of type 2 error will decrease, but it's impossible to determine whether the probability of type 1 error will increase or decrease.is described below. NOTE: If the method is experimental, indicate if it is a true experiment or quasi experiment. 1. I get 30 people and use random assignment to divide the people into two groups. One group reads an article about the statistics of injuries and deaths caused by people using smart phones while driving, the other group watches a short video about a person who killed someone while using their smart phone. Both groups are then monitored to see if either of these made a difference in how often these people use their smart phones use while behind the wheel. What method would that study be? 2. What method asks a series of questions that are all planned in advance?
