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Suppose you will perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of
Barna Research Group collected data showing church attendance by age group (USA Today, November 20, 2003). Use the sample data to determine whether attending church is independent of age. Use a .05
A researcher believe that college students spend a different amount of time talking on the phone than they do instant messaging. She takes a random sample of 12 college students and records the numb
What is the 90% confidence interval estimate of the difference between the two population means?
The average score of all golfers for a particular course has a mean of 66 and a standard deviation of 5. Suppose 100 golfers played the course today. Find the probability that the average score of t
In Manoa Valley the annual rainfall averages 43.6 inches with a standard deviation of 7.5 inches. A year is chosen at random.
The mean price of a pound of ground beef in 75 cities in the Midwest is $2.11 and the standard deviation is $0.56. A histogram of the data shows that the distribution is symmetrical. A local Midwest
If the cost of the part is $20 per unit, what is the economic order quantity? Assume 250 days of operation per year. If the lead time for an order is 12 days, what is the reorder point? If the lead ti
Compare the average number of customers waiting, average number of customers in the system, average waiting time, and average time in the system.
For testing the difference between two population proportions, the pooled proportion estimate should be used in the calculation of the standard error when
The following sample of 16 measurements was selected from a population that is approximately normally distributed: 91 80 99 110 95 106 78 121 106 100 97 82 100 83 115 104. Construct a 99% confidence
According to the Texas Department of State Health Services, there are approximately 17.7 million adults (age 18+) living in Texas, of which 1.28 million have diabetes.
They have collected data on gender, shoe size, and height and have asked you to tell them if they can change their business model to include only one size of shoes - regardless of height or gender o
A researcher wishes to study whether music has any effect on the ability to memorize information. 82 randomly selected adults are given a memory test in a quiet room.
A 95% confidence interval for the difference in reduction of blood pressure between these two drugs is (use Option 2, the conservative method for degrees of freedom)?
There is concern about the percent of on-time flights. A recent survey of two major airlines yielded the following results. At α = 0.05 test the claim that there is a difference in pro
The results from two factor experiment can presented in a matrix with levels if one factor forming the rows and the levels of the second factor forming the columns with seprate sample in each of the
A sample of 40 children with chronic bronchitis are studied and their mean PEF is 279 with a standard deviation of 71. Is there statistical evidence of a lower mean PEF in children with chronic bron
The three forms of the research or alternative hypothesis are:
Multivariable methods can account for variables that are not known during the course of the study?
Two independent samples require a dichotomous outcomes variable
Is there statistical evidence of a lower mean PEF in children with chronic bronchitis? Run the appropriate test at ?=0.05.
What is the 95% confidence interval for the difference in the mean HDL levels between men who exercise regularly and those who do not?
Multivariable methods can be used to assess the impact of the independent variable on the dependent variable as long as there are no confounders present