Consider the following statistics in the mid-season of Spanish La Liga. ... Find a 90% per cent confidence interval between the mean ball possession between Real Madrid and Barcelona. Are they statistically different?

Each year, Lord & Taylor, Ltd., sets up a gift-wrapping station to assist its customers with holiday shopping. Preliminary observations of one worker at the station producedthe following sample time (in minutes per package): 3.5, 3.2, 4.1,3.6, 3.9. Based on this small sample, what number of observationswould be necessary to determine the true cycle time with a 95%confidence level and an accuracy of {5%?

A Harris Poll in 2003 asked a national sample of 2316 adults whether they favored or opposed abolishing the penny, with 59% saying that they oppose it. Determine and interpret a 90% confidence interval for the population parameter of interest. (4 decimals)

Consider the following results for two independent random samples taken from two populations. Sample 1 Sample 2 n1=50 n1=30 xbar1=13.6 xbar=11.1 pop mean 2.1 pop mean=3 What is the point estimate of the difference between the two population means? (to 1 decimal) Provide a 90  confidence interval for the difference between the two population means (to 2 decimals).( ,  ) Provide a 95 confidence interval for the difference between the two population means (to 2 decimals).( ,  )

The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol.     New Drug (n=75) Placebo (n=75) Total Sample (n=150) Mean (SD) Total Serum Cholesterol 182.0 (24.5) 206.3 (21.8) 194.15 (23.2) % Patients with Total Cholesterol < 200 78.0% 65.0% 71.5%   1. Generate the 95% confidence interval for the difference in mean total cholesterol levels between treatments 2. Generate a 95% confidence interval for the difference in proportions of all patients with total cholesterol < 200.

The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol.   New Drug (n=75) Placebo (n=75) Total Sample (n=150) Mean (SD) Total Serum Cholesterol 182.0 (24.5) 206.3 (21.8) 194.15 (23.2) % Patients with Total Cholesterol < 200 78.0% 65.0% 71.5% Generate the 95% confidence interval for the difference in mean total cholesterol levels between treatments Generate a 95% confidence interval for the difference in proportions of all patients with total cholesterol < 200. How many patients would be required to detect the difference in proportions observed in the current study with 80% power. A new investigation will be enrolling subjects to demonstrate the efficacy of the drug in individuals with high cholesterol at an early age.  A two-sided test is planned at  α = 0.05

The following are six observations collected from treatment 1, ten observations collected from treatment 2, and eight observations collected from treatment 3. Test the hypothesis that the treatment means are equal at the 0.05 significance level.  Treatment 1 Treatment 2 Treatment 3 3 9 6 2 6 3 5 5 5 1 6 5 3 8 5 1 5 4   4 1   7 5   6     4       If H0 is rejected, can we conclude that treatment 2 and treatment 3 differ? Use the 95% level of confidence. (Round your answers to 3 decimal places.)             95% confidence interval is:   to   We can conclude that the treatments 2 and 3 are different.

1. Consider the following results for independent samples taken from two populations a. What is the point estimate of the difference between the two population proportions?b. Develop a 90% confidence interval for the difference between the two population proportions.c. Develop a 95% confidence interval for the difference between the two population proportions

A physician compared the cholesterol levels of a representative sample of Americans who ate an American diet versus a representative sample of those who followed a Mediterranean diet. Below are the means, standard deviations, and sample sizes for both samples. Though in some studies a Mediterranean diet has been shown to be beneficial, this was one of the first studies on an American population and the physician had made no advance predictions about the outcome. American diet (control): M = 230, s = 24, n = 36. Mediterranean (experimental): M = 190, s = 26, n = 36. Use α = .05.   6. Calculate the test statistic                     7. Estimate the magnitude of the effect size (Cohen’s d).       8. Calculate the 95% confidence interval for the differences between population means.