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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
An open-label study (where participants are aware of the treatment they are taking) is run to assess the time to pain relief following treatment in patients with arthritis. The following linear regr
Chicken Delight claims that 90 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 80 orders revealed that 68 were delivered within the promised time.
Estimate the value of the population proportion. (Round your answer to 3 decimal places.). Develop a 95 percent confidence interval for the population proportion.
A survey of 36 randomly selected "iPhone" owners showed that the purchase price has a mean of $392 with a sample standard deviation of $175. Compute the standard error of the sample mean.
A population is estimated to have a standard deviation of 13. We want to estimate the population mean within 3, with a 99 percent level of confidence.
The estimate of the population proportion is to be within plus or minus .05, with a 99 percent level of confidence. The best estimate of the population proportion is .19. How large a sample is requi
Conduct an historical study of a random variable of your choice, collect a sample of observations and provide detailed descriptions of this sample.
What is the expected time to pain relief for a male following treatment? What is the expected time to pain relief for a participant aged 50 following treatment?
The mass (in grams) of random samples of adult male tuatara from two locations are given below. we wish to know if animals from location a have a larger mean mass than animals from location b.
Suppose that the random variable X represents the length of a punched part in centimeters. Let Y be the length of the part in millimeters. If E(X) = 5 and V(X) = 0.25, what are the mean and variance
A certain brand of candies have a mean weight of .8592 g and a standard deviation of .052 based on a sample of a package containing 466 candies. the package label stated that the net weight is 397.7
What is the approximate probability that the sample proportion will be greater than 0.5? This has the effect of the polling organization incorrectly predicting the result of the upcoming election.