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Is a binomial distribution a good model for determining the probabilities of various numbers of fatal accidents during a year? Explain your reasoning and include a discussion of the four criteria fo
If we want to use mileage, color, and/or condition of the vehicle on a sample of 2009 Chevy Corvette ZR1 cars to predict the price of these vehicles with multiple regression, what can we use as inde
A medical test for a certain disease is known to have sensitivity 98% ( probability of giving positive result to a carrier of the disease) and 92% specificity ( probability of giving negative resul
Using the data below, generate a 95% confidence interval for the difference in proportions of women delivering preterm in the experimental and standard drug treatment groups.
Using the data shown below, suppose we focus on the proportions of patients who show improvement. Is there a statistically significant difference in the proportions of patients who show improvement
IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X = IQ of an individual.
Researchers collected data from a random sample of men and women to determine if women spend more time doing housework then men. The data are below.
Among 18 patients with depression, the mean number of treatment days was 4.7 with a standard deviation of 9.3. For 10 subjects with bipolar disorder, the mean number of treatment days was 8.8 with a
The data are presented below. Is there evidence of a change in fine motor skills? Use a 5% level of significance. Make sure to 1. give the null and alternative hypotheses, 2. calculate the test stat
A clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo.
A board of directors consists of twelve men and five women. A four-member search committee is randomly chosen to recommend a new company president. What is the probability that all four members of t
Report the 95% confidence interval for the proportion of all adult office workers who have worn a Halloween costume to the office at least once. (Round final calculations to the nearest tenth of a p
A negative relationship between two variables means that as the x variable increases, the y variable increases.
A polling agency wants to determine the size of a random sample needed to estimate the proportion of homeowners who keep a hand gun in their home for security.
Suppose that the probability that a person between the ages of 19 and 24 checks their daily horoscope is 0.12. If 400 randomly selected people between the ages of 19 and 24 were asked "Do you check
For a hypothetical magazine, the probability that the reader is male given that the reader is at least 35 years old is 0.30. The probability that a reader is male, given that the reader is under 35,
Is the number of visits significantly less for the dog owners than for the participants in the control group? Use a one tailed test with alpha level set at p<.05
A previous study indicates that the percentage of chain smokers, p, who have lung cancer follows a beta distribution with mean 70% and standard deviation 10%. Suppose a new data set collected shows
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 385 hours. The population standard deviation is 84 hours.
Now suppose the incidence of the disease in another population segment is 30%. Compute the probability that the person actually has the disease, given that his/her test is positive; Ans.
A machine produces ball bearings is set so that the average diameter is .50 inch. A sample of 10 ball bearings was measured with the results shown here. Assuming that the standard deviation is .05 i
The equation of the estimated regression line that relates the response (dependent) y-variable (cash bonus) to the predictor (independent) x-variable (annual pay) is
The null and alternate hypotheses is: H? : µ = 20; H? : µ > 20- (I think this is correct). Calculate the p-value using t-distribution (exact value): 0.1577 (What I calculated)
A organic food company wants to determine the best process for blanching dark green vegetable material so it can be added to other food products without losing vitamin A. They are examining three di
The amount of coffee dispensed in a paper cup of a vending machine is normally distributed with a mean of 4.5 oz. and standard deviation of 0.2 oz. What percent of all the paper cups will have more