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Which of the following correlation coefficients represents the variables with the weakest degree of relationship?
A survey of an urban university (population of 25,450) showed that 750 of 1100 students sampled attended a home football game during the season. Using the 99% level of confidence, what is the confid
A researcher notes that the correlation in the group she studies is so large that if there were not a correlation among people in general, there is less than a 5% chance of getting her correlation.
Annual starting salaries for college graduates with degrees in business adminstration are generally expected to be between $30,000 and $45,000 with a population standard deviation of $3750. Assume t
The lifetime of a disposable water filter is normally distributed with mean m = 30 gallons and standard deviation s = 6 gallons. What is the probability that a filter selected at random will last fr
Messages arrive at an interactive message center according to a counting process with the average inter-arrival time of 15 seconds. Choosing a frame size of 5 seconds, compute the probability that d
A student has computed that it takes an average (mean) of 16 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to an early class. One day it took the student
A motel accepts 340 reservations for 315 rooms on July 1, expecting 10 percent no-shows on average from past records. Use the normal approximation to the binomial to find the probability that all gu
Then respond to the following: What are some of the factors you would want to consider in assessing such a difference in mortality? Discuss possible explanations as to why the crude mortality rate i
Let X1, X2 be a random sample of size 2 from a population X with E(X)=mu and V(X) = 36. Let T1 = (2X1 + X2)/3 and T2 = (3X1 - X2)/3 be two unbiased estimators for mu.
The compressive strengths of a random sample of 64 specimens of an alloy yielded sample average strength of 5566 psi and sample standard deviation of 82 psi. Find a 95% confidence interval for the t
The thickness of wafers in semiconductor manufacturing has a mean of 10 micrometers and standard deviation of 0.8 micrometers. Find approximate probability that the average thickness of 49 wafers ex
The main reason women seek medical attention for menopausal symptoms is hot flashes. Dietary supplements containing isoflavones derived from natural sources such as soy or red clover are marketed as
A survey of an urban university (population of 25,450) showed that 870 of 1100 students sampled supported a fee increase to fund improvements to the student recreation center. Using the 99% level of
Chemical company claims the one majory product has on average 4.0 fluid oz of caustic materials per gallon.It further states that the distribution of caustic materials per gallon is normal and has
The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What assumptions do you need to make about the shape of the population distribution of all
Run a regression of the dependent variable on the continous and categorical independent variables. What conclusion can you draw about the factors affecting the dependent variable?
The equation for a regression line predicting the number of hours of TV watched by children (Y) from the number of hours of TV watched by their parents (X) is Y' = 4 + 1.2X. The sample size is 12.
the slope of the regression line and test if it differs significantly from zero. the 95% confidence interval for the slope.
In a different regression analysis, 40% of the variance was explained. The sum of squares total is 1000. What is the sum of squares of the predicted values?
A researcher conducted an experiment on the effects of a new "drug "on depression. The researcher had a control group that received nothing, a placebo group, and an experimental group that received
The data are the times, in minutes, required to teach each sign to each subject. Are there differences amongst chimps and amongst signs? These data meet the assumptions of parametric statistics.
Test scores have a stadard deviation of 18 and a mean of 69. if at random, 49 test scores are picked what is the probability than the mean score is less than 62?
Use the one-proportion z-test to perform an appropriate hypothesis test. Be sure to check the conditions for using that procedure.
Generate 1000 samples of size 350 from a Binomial distribution with probability 2/3. Calculate the mean and standard deviation of the 1000 samples, and compare to the results in (c).