A certain HMO is attempting to show the benefits of managed care to an insurance company. The HMO belleves that certain typ doctors are more cost-effective than others. One theory is that certification leel is an important factor in measuring the cost- effectiveness of physicians. To investigate this, the HMO obtained independent random samples of 30 physicians from each of certification levels- Board certified (C); Uncertified, board eligible (E); and Uncertified, board ineligible (1)- and recorded the member, per-month charges for each (a total of 90 physicians). Identify the dependent (response) variable for this study. O the HMO the three certifications groups- C, E, and I the 90 physicians the total per-member, per-month charge

A nonprofit company concerned with the school dropout rates has designed a tutoring program aimed at students between 16 to 18 years old. A national center for educational statistics reported that the high school dropout rate for the year 2000 was 10.9​%.One school​ district, who adopted the use of the​ nonprofit's tutoring program and whose dropout rate has always been very close to the national​ average, reported in 2004 that 158 of their 1769 students dropped out. Is their experience evidence that the tutoring program has been​ effective?   Determine the hypotheses for this test. Choose the correct answer below A. H0​: p=0.109 HA​: p≠0.109   B. H0​: p≠0.109 HA​: p=0.109   C. H0​: p=0.109 HA​: p<0.109   D. H0​: p=0.109 HA​: p≥0.109   E. H0​: p≥0.109 HA​: p=0.109   F. H0​: p≤0.109 HA​: p=0.109   Compute the test statistic. enter your response here ​*______*   Find the​ P-value. enter your response here* ______* 3. Is their experience evidence that the tutoring…

Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.

Computer-mediated communication (CMC) is a form of interaction that heavily involves technology (e.g., instant messaging, email). A study was conducted to compare relational intimacy in people interacting via CMC to people meeting face-to-face (FTF).   Participants were 48 undergraduate students, of which half were randomly assigned to the CMC group and half assigned to the FTF group. The variable of interest, relational intimacy score, was measured (on a 7-point scale) for each participant after each of three different meeting sessions. Summary statistics for the first meeting session are given here. The researchers hypothesized that, after the first meeting, the mean relational intimacy score for participants in the CMC group would be lower than the mean relational intimacy score for participants in the FTF group. Test the researchers’ hypothesis using α = .10.                                                                     CMC                                           FTF Number…

The federal guideline for smog is 12% pollutants per 10,000 volume of air. A metropolitan city is trying to bring its smog level into federal guidelines. The city comes up with a new policy where city employees are to use city transportation to and from work. A local environmental group does not think the city is doing enough, and that the pollution percentage is greater than 12%. An independent agency hired by the city to run a test used a random sample size of 250 and found the pollutants at 15%. Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.

You're trying to find out how many students who graduate with accounting degrees from large universities are employed at graduation. You design an experiment where you collect information on several variables from recent graduates from the University of Florida accounting program. Specifically, you survey 198 alumni about their employment status, age at graduation, gender, and grade point average. What's the population, and what's the sample?       The population is everyone at the University of Florida, and the sample is the 198 alumni who returned the survey. The population is the 198 alumni who returned the survey, and the sample is accounting alumni from large universities. The population is college students at large universities, and the sample is accounting students. The population is accounting program alumni at large universities, and the sample is the 198 alumni who returned the survey.   Researchers are interested in increasing female participation in the technology…

Based on market sales figures, approximately 7.9% of car owners in California own an electric or plug-in hybrid vehicle (EV). A marketing director at a local car dealership would like to know if their sales of EV's is any greater than what the state's sales proportions are. To examine this, they look over the last 500 sales (which they consider to be a representative sample of all car sales) and determine that 10.4% of those were EV sales. Is this statistically significant evidence that the dealership sells a higher proportion of EV's than the overall state's proportion? Which of the following are the correct null and alternative hypotheses for the hypothesis test used to determine significance? Ho:p = 0.079 Haip > 0.079 %3D O Ho:p = 0.079 Hai p > 0.104 O Ho:p 0.079 O Ho:p 0.104