and is a lan-%bogat granata s74 5. Improving Observational Studies - Fill in the blanks If we want to check out effects of a drug using an observational study, then we should use a the patients large pool of subjects who did not take the drug those individuals who who took the drug in characteristics such as and other lurking variables. It is important to think of as many possible lurking variables as possible to use in the matching. Any lurking variables that have not been matched can still result in
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- A psychologist is interested in how men and women react toward mental health counseling. She asked 60 men and 90 women whether they would consider using mental health services should they think they might need them. The choices were no, maybe, and yes. The following table lists the answers for the men and women in the form of a 2 x 3 contingency table. Using a chi-square analysis answer the question: Is there a relationship between men and women's willingness to use mental health counseling services? Use alpha = .05 No Maybe Yes Males 17 32 11 Females 13 43 34 df= Critical value of 2 = Calculated value of 2 = Calculated p Conclusion: State your results as if you are writing it in an APA paperThe National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project. Of particular interest is whether the number of bidders increases or decreases the amount of the winning bid. Bidders Price 9.0 5.1 9.0 8.0 3.0 9.7 10.0 7.8 5.0 7.7 10.0 5.5 7.0 8.3 11.0 5.5 6.0 10.3 6.0 8.0 4.0 8.8 7.0 9.4 7.0 8.6 7.0 8.1 6.0 7.8 Given: Correlation of Coefficient: 0.7064 (This is correct) Coefficient of determination: 49.90% (This is correct) ŷ = 11.2360 + (-0.4667)x (This is correct) Create a scatter plot of the data Complete a regression analysis of the relationship. Slope = ______ Estimate the winning bid if there were seven bidders. Winning bid cost ______ millions. Compute the 95% prediction interval for a winning bid if there are seven bidders. [ _____________, ______________]The National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project. Of particular interest is whether the number of bidders increases or decreases the amount of the winning bid. Bidders Price 9.0 5.1 9.0 8.0 3.0 9.7 10.0 7.8 5.0 7.7 10.0 5.5 7.0 8.3 11.0 5.5 6.0 10.3 6.0 8.0 4.0 8.8 7.0 9.4 7.0 8.6 7.0 8.1 6.0 7.8 GIVEN: correlation coefficient: - 0.7064 Slope: -0.4667 Coefficient of determination: 49.90% regression equation: ŷ= 11.2360 + (-4467)x FIND: Estimate the winning bid if there were seven bidders. Winning bid cost _________ millions. Explain. Compute the 95% prediction interval for a winning bid if there are seven bidders. [ _______________ , _______________ ] (Explain).
- A company that sells digital devices has its stores in several cities in Albania. The Marketing Manager plans to transmite an advertisement for the digital camera product on local television and watch sales of that product, to see the link that exists with the number of ads transmitted and product sales. After two days, the results were presented in the following table: City Trasmitted Sales(in 000 Euro) Durrës 4 15 Sarandë 2 8 Fier 5 21 Berat 6 24 Lezhë 3 17 S S = 1.58 S = 6.1 a) What is the dependent variable?b) Construct the scatterdiagram of this connection.c) Calculate the coefficient of variation and the coefficient of determination.d) Interpret the relationship between two variables.e) What is the equation that connects these two variables? Explain the values for a and b.f) What is the expected level of sales if 10 ads are trasmitted9. A recent study claims that using music in a class enhances concentration and consequently helps students absorb more information. A researcher decided to test this claim on a smaller group of randomly selected students from three different classes. Each classroom was provided with a different environment for students to study. Classroom A had constant music being played in the background, classroom B had variable music being played and classroom C was a regular class with no music playing. After one month, the researcher conducted a test for all the three groups and ranked their scores. What statistical test would be most appropriate for testing the research hypothesis? Explain your answer.Two groups of secretaries operate under the same manager. Both groups have the same number of people, use the same equipment, and turn out about the same amount of work. During one maintenance penod group A had 10 service calls on the equipment, while group B had only 6 calls From these data, would you conclude that group A was harder on the equipment?
- The owner of a pet store is trying to decide whether to discontinue selling specialty clothes for pets. She suspects that only 10% of the customers buy specialty clothes for their pets and thinks that she might be able to replace the clothes with more interesting and profitable items on the shelves. Before making a final decision she decides to keep track of the total number of customers for a day, and whether they purchase specialty clothes for their pet. a) Assuming the pet store owner is correct in thinking that only 10% of her customers purchase specialty clothes for their pets, how many customers should she expect before someone buys a garment for their pet? b) What is the probability that she does not sell a garment until the 5th customer? c) What is the probability that exactly 4 of the first 10 customers buy specialty clothes for their pet? d) What is the probability that at least 3 of the first 35 customers buy specialty clothes for their pet?…A company recently announced that the performance of employees would be rated on a scale from 1 to 4. The top 10%of employees would receive a1 rating, 15% of the employees would be rated with a 2, and 55%would be rated with a 3. The remaining employees would receive a 4 rating. The rating scheme is known as a forced-ranking system. It was begun after the government bailed out the company and forced the company to link compensation to performance. Suppose that one facility of the company has 350 employees. Determine the number of employees who can receive each rating. employees can receive a rating of 1.----employees can receive a rating of 2.---- employees can receive a rating of 3.---- employees can receive a rating of 4.----