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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 ...
Suppose that 9 observations are drawn from a normal population whose standard deviation is 2. The observations are: 15, 9, 13, 11, 8, 12, 11, 7, and 10.
Three different relaxation techniques are given to randomly selected patients in an effort to reduce their stress levels.
A new weight-watching company advertises that those who join will lose, on average, 10 lbs. the first two weeks.
Dr. S wishes to measure the effect of TV viewing on reading scores in elementary school children. The data for the sample are shown here
Dr. Z at the Clinic wishes to see whether the pulse rates of smokers are higher than the pulse rates of nonsmokers.
What are research questions that the authors tried to answer? Could you put them in a set of hypotheses?
American Demographics reported the results of a survey on the planning habits of men and women
In a test of hypothesis, the null hypothesis is that the population mean is equal to 60 and the alternative hypothesis