Suppose Wesley is a marine biologist who is interested in the relationship between the age and...
Suppose Wesley is a marine biologist who is interested in the relationship between the age and the size of male Dungeness crabs. Wesley collects data on 1,000 crabs and uses the data to develop the following least-squares regression line where ? is the age of the crab in months and ?ˆ is the predicted value of ?, the size of the male crab in cm. ?ˆ=8.2052+0.5693? What is the value of ?ˆ when a male crab is 21.7865 months old?...
ante 7. You are a researcher interested in the relationship between age of an infant (in months) and hours spent sleeping. Suppose that you sampled N - 10 infants between the ages of 1 - 12 months. After fitting a simpler linear regression model, you found that the intercept of your begression line was 14.72 and the slope was 0.24. (a) Write the regression equation for predicted scores. Include the parameter estimates and informative labels (i.e., use 14.72,-0.24 hours sleep,...
1. (55 points) The investigators are interested in asses the relationship between Systolic Blood Pressure (SBP) in mm Hg and Age in years among Hypertensive Patients. Specif- ically, whether a patient's SBP can be predicted from his or her age. They selected n=122 patients at random from a medical record database in a hospital. Assume that the simple linear regression model is appropriate. The following table shows regression output of a simple linear regression model relating the SBP to the...
An economist wants to determine the relationship between a person's age (in years) and his or her annual income in thousands of dollars). After gathering data from a sample of adults and fitting a regression model, the economist gets the following output from Excel: 0.523 0.274 Regression Statistics Multiple R R Square Adjusted R Square Standard Error Observations 0.244 49.637 27 ANOVA df F Significance F 0.005 9.412 Regression Residual Total 1 25 26 SS MS 23190.436 23190.436 61596.524 2463.861...
Question 3 A researcher is interested in the relationship between the birth weights of infants and mothers' smoking habits. He uses the birth weight of an infant (ounces) and the average number of cigarettes the mother smokes per day during the pregnancy as the dependent and independent variables, y and x, respectively. Using a sample of size (1388 the following model is obtained by the method of least squares: y-119.770.514.x (3.15) (0.13) SE e the figures in brackets are the...
2. Suppose we are interested in the relationship between number of hours of exercise per week and systolic blood pressure in males 50 years of age. A random sample of 10 males 50 years of age is selected. In this analysis, the IV is number of hours of exercise per week and the DV is systolic blood pressure. The data are as follows: X = #hrs of exercise WkY=systolic BPXY 120 4 10 3 3 1 2 2 110 120...
Research question: In the population of all American adults, how strong is the relationship between age and reaction time? Data were collected from a representative sample of 500 American adults concerning their ages (in years) and reaction times (in milliseconds). What procedure should be used to estimate the strength of this relationship in the population? CI for single mean CI for single proportion CI for difference in means CI for difference in proportions CI for correlation 2Research question: To what...
________________ ________________ ______________ 11. Using Excel - Scatter diagrams, estimated regression equations, and trendlines Suppose a company records data on sales calls, induding the length of each call and whether a sale was made. The manager is interested in determining whether there is a relationship between the average time spent per call and the number of sales made by each employee, so she obtains the average call length and the total number of sales over a 2-week period for a...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the electronics industry, component parts are commonly shipped from suppliers in large lots. Inspection of a sample of n components can be viewed as the n trials of a binomial experimem. The outcome for each component tested (trialD will be that the component is classified as good or defective defective components in the lot do not exceed 1 %. Suppose a random sample of fiver...
1. Oral acetaminophen has been ordered for a young child who has a fever. A liquid form has been obtained by the nurse to increase the chance of problem free administration. Prior to administration, the nurse is going through the rights of medication administration. When confirming the right dose, what term is the most appropriate? a. "160 mg" b. "one teaspoon" c. "one third of a tablespoon d. "SmL 2. A pregnant woman asks why she needs to take a...