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You are asked if there is a real difference between the percentage of Asians and Hispanics who have a positive attitude toward the police in the larger population, or is this sample difference likel
The sample means obtained are X1(bar)=86 and X2(bar)=87. It is known from previous studies that the population variances are 8.1 and 7.3 respectively. Using a level of significance of .01, is there
Six people have declared their intentions to run for trustee seat in the next local election. A political poll is condcted during the campaign among 1,200 randomly sampled voters to determine if the
Is the correlation between LOT-R Total scores and Avoidance-Distraction coping style statistically significant? Is this relationship relevant to practice? Provide rationales for your answers.
Molly's Candle Shop has several retail stores in the coastal areas of North and South Carolina. Many of Molly's customers ask her to ship their purchases. The following chart shows the number of pac
What is the value called that separates the region of rejection from the region of non rejection?
What is the base growth rate? round to 4 decimal places as needed. What is the current growth rate? round to 2 decimal places as needed
The 95% confidence interval for the difference between two treatment means extends from -2.50 to +5.50. Based on this information, you can conclude that there is no significant difference between t
In the linear regression equation, Yi=35.0+3Xi, which of the following interpretation is correct, here X is the number of hours a student studies and Y is the final exam score
In a linear regression model of predicting first year sales using an aptitude test, the coefficient of multiple determination r-squared = 0.37. This can be interpreted as 37% of the variation in the
The recent default rate on all student loans is 6.8 percent. In a recent random sample of 293 loans at private universities, there were 11 defaults.
Using the 0.01 level of significance, is there evidence that the population mean is above 32 minutes? What is your answer in (a) if X (bar) = 37 minutes and s = 27 minutes?
A manufacturer of tires wants to advertise a mileage interval that excludes no more than 10% of the mileage on tires he sells. All he knows is that, for a large number of tires tested, the mean mile
Using all possible predictors select a model using forward regression. Using all possible predictors select a model using backward elimination.
Consider two values, r = 0.08 and r = ?0.58. Describe them in relationship to each other. Describe the clinical importance of both r values.
Is there any difference between the proportion of americans who wish they were rich and the proportion of canadians who wish they were rich? A random sample of 1,000 americans showed that 550 wish t
The Lakeside Boatworks is planning to manafacture three types of molded fiber glass recreational boats-a fishing (bass) boat, a ski boat, and a small speedboat. The estimated selling price and varia
Using the data below construct a table that combines robbery and assault into one category, labeled "violent, and theft and burglary into another category, labeled "property" and create a frequency
Approximate using Poisson distribution the number of states that Peter is going to get wrong. What is the probability that he gets all states right?
Candidates Smith and Johnson are running for US President. Peter the Pundit estimates the probability that Johnson wins in each of the 51 states (let us call Washington, DC also a state).
A testing organization reported that 5% of their scores are under 450 while 40% of their scores exceed 1085. Assume that test scores are normally distributed, what is the average and standard deviat
What are the null and alternative hypotheses? What is the test statistic? What is the P=Value? What is the conclusion about the null hypothesis?
Substrate concentration (in mg/cm3) of influent to a reactor is normally distributed with mean 0.3 and standard deviation 0.06. What is the probability that the concentration is between 0.22 and 0.32?
Components of a certain type are shipped to a supplier in batches of ten. Suppose that 70% of all such batches contain no defective component, 20% contain one defective component, and 10% contain tw
Construct a line chart for the number of prior DUI (driving under the influence) arrests received by a sample of jail inmates currently incarcerated for drunk driving.