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A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood.
Batteries' life spans are normally distributed. The mean is 2300. The standard deviation is 20 hours. What percent of batteries have a life span of more than 2330 hours?
Consider the formula used for any confidence interval and the elements included in that formula. What happens to the confidence interval if you
Use the normal distribution of SAT critical reading scores for which the mean is 500 and the standard deviation is 108 Assume the variable x is normally distributed.
What are your thoughts and Research regarding issues facing US? What decision making process needs to be implemented? I know there is no overnight solution, but it needs to start at somewhere. Do y
1. In a hospital's shipment of 3,500 insulin syringes, 14 were unusable due to defects. Is this sufficient evidence to reject future shipments from this supplier if the hospital's quality standard r
A random sample of medical files is used to estimate the proportion p of all people who have blood type b.
In a sample of 61 randomly seldom selected students, 31 flavored the amount being budgeted for next years intramural and interscholastic sports. Construct a 98% confidence interval for the proportio
A technician monitoring a group of five computers in an automated manufacturing facility. it takes an average of 15 minutes, exponentially distributed, to adjust any computer that develops a problem
The estimate of the population proportions is to be within plus or minus .10, with a 95 percent level of confidence. The best estimate of the population proportion is .15. How large a sample is requ
The owner of West-End Kwick Fill Gas wants to determine the portion of customers that pay with a credit card. He surveys 100 customers and finds that 50 pay with a credit card. Develop a 95 percent
From the records he selects a random sample of 60 customers and finds the mean number of gallons is 9.60. Develop a 99 percent confidence interval for the population.
How would a researcher know whether linear regression was the appropriate statistical technique to use? What are some of the benefits of fitting the relationship between two variables to an equation
Let X and Y be independent geometric distributions. U = min(X,Y), V = X - Y (a) Show that U and V are independent (b) Find the distribution of Z = X / (X+Y) (c) Find the joint pdf of X and (X +Y)
The computer server through which the e-mails are routed showed that s = 19.4. Has the new policy had any effect? Use a 5% level of significance to test the claim that there has been a change (eithe
A random sample of 360 medical doctors showed that 106 had a solo practice. As a news writer, how would you report the survey results regarding the percentage of medical doctors in solo practice? Wh
Suppose that the average life of a refrigerator before replacement is m = 14 years with a (99.7% of data) range from 8 to 20 years. Let x = age at which a refrigerator is replaced. Assume that x has
Suppose a certain species of fawns between 1 and 5 months old have a body weight that is approximately normally distributed with mean m = 21.1 kilograms and standard deviation s = 3.7 kilograms. Let
Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. Suppose that for healthy females, x has an approximately normal distribution with mean m = 4.7 and standard deviat
Calculate and interpret the Rate Ratio, Etiologic Fraction, and Population Etiologic Fraction.
Obtain the margin of error E, for the confidence interval you found in part (a) Determine the sample size required to have a margin of error of 0.6 cm with a 95% confidence level.
Which of the following is an example of a parametric test?
Indicate whether the data are a time series or a cross section. Number of cars sold in a dealership each day in December.
The quarterly return for a group of 50 mutual funds with mean of 2.8% amd standard deviation of 5.1%--can be modeled by a normal model. Based on the model N (0.028, 0.051). what are the cutoff value