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Heights of men on a baseball team have a bell-shaped distribution with a mean of 177cm and a standard deviation of 5cm. Using the empirical rule, what is the approximate percentage of the men betwe
Does correlation equal causation? Does the strength of correlation depend on the direction of the relationship? What is the meaning of a zero correlation? Explain your answers.
What confidence interval(s) from Table should be used to compare the memorization score for the two methods? Explain.
Are low carbohydrate diets effective? A random sample of six individuals who wanted to try a low carbohydrate diet was obtained. Each individual was placed on a low carbohydrate diet for eight week
What type of observational study did the researchers at the University of Wisconsin use? Explain.
A 95% confidence interval for the proportion of women that have ever dozed off while driving is 0.07 to 0.14. For men, a 95% confidence interval for the proportion that have ever dozed off while dr
Set up the calculation of a 95% confidence interval to estimate the population mean number of hours slept last night.
Explain what will happen to the width of a confidence interval (increase, decrease, or remain the same) as a result of each of the following changes:
Are you annoyed with spam e-mail? Suppose a random sample of 200 Penn State students was asked this question of which 80% said that they are annoyed. From the provided information we can find the f
A study involving ten people wants to compare the effectiveness of two different brands of antihistamines with regard to enhancing sleep.
Determine whether or not each of the following terms applies to this observational study. a. prospective b. retrospective c. case-control study
A study wants to determine if taking fish oils can reduce depressive symptoms. A group of 50 volunteers who suffered from mild depression were randomly divided into two groups.
A research team compared two methods of measuring tread wear on tires. Eleven tires were each measured for tread wear by two different methods:
Do we have to worry about confounding variables in this instance? Why? If so identify a possible confounding variable?
What type of study is found-observational or randomized experiment? Explain.
Are we 95 percent confident that this proportion exceeds .48, the historical proportion of customer delight for Bank of America?
Using the 95 percent confidence interval, can the bank manager be 95 percent confident that μ is less than six minutes? Explain.
If, for the sake of argument, we assume that 30 percent of Americans (18 year or older) say figure skating is their favorite event (that is, p = .3), calculate the probability of observing a sample
Find the mean and the standard deviation of the sampling distribution of the sample mean x‾.
Describe the shape of the sampling distribution of the sample mean x‾. Do we need to make any assumptions about the shape of the population? Why or why not.
A small cohort study is conducted in 13 patients with an aggressive cellular disorder linked cancer. The clinical courses of the patients are depicted graphically below. A) Compute the prevalence o
Compute the cumulative incidence of stroke in persons over 75 years of age
Compute the Relative Risk of coronary artery disease in patients receiving the new medication as compared to placebo. Relative Risk =
What is the expected CD4 count for a patient taking supplements who has had HIV for 2.5 years.
What is expected time to pain relief for a male following treatment?