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The accompanying table gives the cost and an overall quality rating for 15 different brands of bike helmets (www.consumerreports.org).
a. Construct a scatterplot using y = quality rating and x = cost.
b. Based on the scatterplot from Part (a), does there appear to be a relationship between cost and quality rating? Does the scatterplot support the statement that the more expensive bike helmets tended to receive higher quality ratings?
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the lower and upper limit of the 90% CI?
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
Evaluate and discuss the following hypothesis based on what you have learned about hypothesis statements. Should they be written differently, or are the sufficient the way they are stated?
Identify a business research topic and Define the research questions for the identified problem or opportunity
What is the required sample size if you reduced your confidence level to 90%. You expect the proportion at your school to be lower and could be near 50%
If a ninth planet exists, then its orbit is perpendicular to that of the other planets. Either a ninth planet is responsible for the death of the dinosaurs.
8.175 How much power does this study have to detect a mean difference of 5 units in the symptom scale if a two sided test is used with α = .05?
The GMAT scores of students who are potential applicants to a university are normally distributed with a mean of 487 and a standard deviation of 98.
Create and interpret a 90% confidence interval.- Would a 98% confidence interval have a larger or smaller margin of error? Explain.
Calories in each hamburger measured. Can the reporter conclude, at α = 0.05, that the hamburgers from the two chains have a different number of Calories?
a survey conducted by the american automobile association showed that a family of four spends an average of 215.60 per
assume you are in charge of a production line which allows for no more than 1 defectives in order to be in compliance.
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