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Can the formal hypothesis testing approach be used for nonparametric tests? How are parametric and nonparametric statistics different
A sample of 40 investment customers serviced by an account manger are found to have had an average of $23,000 in transactions during the past year
The manufacturer of a new antidepressant claims that, among all people with depression who use the drug, the proportion of people who find relief
On average an organization has received 20% positive returns on their annual request for donations, out of 220 that were mailed
Confidence Interval for Effects of Alcohol: An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor
In a study of women and heart disease, the following sample results were obtained: Among 10,239 women with a low level of physical activity
A sample of high school seniors showed that 18 of 60 who owned PlayStation 3 spent more than an hour a day playing games, compared with 32
Systolic Blood Pressure for Women: Systolic blood pressure results from contraction of the heart. Based on past results from the National Health Survey
At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution
An experiment was performed to measure the effect of sleep deprivation on cognitive performance. twenty college juniors were randomly selected from a group
Over a 20 year period, the average grade point average of applicants to our graduate program has been found to be 3.27
Treating Chronic Fatigue Syndrome Patients with chronic fatigue syndrome were tested, then retested after being treated with fluorocortisone.
(a) Make a scatter plot of the data. What does it suggest about the correlation between X and Y? (b) Use Megastat or Excel to calculate the correlation
The mean wages paid to Americans between the ages of 45 and 64 across all demographics in the United States is $38,740 with a standard deviation of $156.
The lower the level of significance, the harder it is to reject the null. In sum, you want to be REALLY sure that your alternative hypothesis is correct
An independent testing laboratory has been commissioned to determine the relative fuel economy of cars, light trucks, and sport utility vehicles.
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used
Suppose a study is constructed to test a claim, at a 0.05 significance level that a population proportion is 40%.
Does the type of display used in a supermarket affect the sales of products? As the regional sales manager for Aldi's Foods, you are interested in comparing
A real estate agency wants to estimate the difference in the appraised values of single-family homes in two communities.
A study was performed to determine if males who quit exercising gain weight.
You are interested in the effect of how the age of students VS affects their grades in college.
Use alpha = 0.05 unless specified otherwise. For each hypothesis test state HA (the research hypothesis) and H0 (the null hypothesis) using the proper symbols
The manager of a local branch of a bank believes that over the past few years the bank has begun to cater to a different clientele
The following data represent samples of size 45 which were drawn randomly from the graduating classes of three competing high schools ...