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Construct a scatter diagram and interpret.
Bicycle helmet use. Table1lists data from a cross-sectional survey of bicycle safety. The explanatory variable is a measure of neighborhood socioeconomic status (variable RFM). The response variable is "percent of bicycle riders wearing a helmet" (P Helm).
Percent of school children receiving free or reduced-fee lunches at school (variable P_RFM) and percent of bicycle riders wearing a helmet (variable P_HELM). Data for this study was recorded by field observers in October of 1994.I (i) School P_RFM P-HELM 1 Fair Oaks 50 22.12 Strandwood 11 35.93 Walnut Acres 2 57.94 Disc Bay 19 22.25 Belshaw 26 42.46 Kennedy 73 5.87 Cassell 81 3.68 Miner 51 21.49 Sedgewick 11 55.210 Sakamoto 2 33.311 Toyon 19 32.412 Lietz 25 38.413 Los Arboles 84 46.6
Construct a scatterlpot of P_RFM and P_HELM. If drawing the plot by hand, use graph paper to ensure accuracy. Make sure you label the axes. After you have constructed the scatterplot, consider its form and direction. Identify outliers, if any.
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 5 of µ? Use the value 20 for the population standard deviation of scores on this subsection.
Speed of cars travelling on I-85 in Gaston County is normally distributed with average speed (µ) of 66 MPH and standard deviation (σ) of 8 MPH.
What is the probability of finding 1 or more children with chronic bronchitis in a population where the incidence rate of chronic bronchitis is 10% (like the one above?)
An exam consists of 10 true or false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly six questions correctly? (Round the answer to three decimal places)
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
State along statistical certainty there is a difference among the population proportions of those favoring Statement.
Make a stem plot for the men height data. Calculate the five-number summary for the women.
Be sure the appropriate assumptions and conditions are satisfied before you proceed.
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
A manufacturer of billiard balls is testing three additives to the basic plastic. Show the partial ANOVA table
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