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If 15 subjects take a pre-test and a post-test with a mean change score of 1.5, and if the standard deviation of the comparison distribution is calculated
One group of accounting students took a distance learning class, while another group took the same course in a traditional classroom.
A manufacturer of chocolate candies uses machines to package candies as they move along a filling line. Although the packages are labeled as 8 ounces
A restaurant manager wants to compare mean daily sales between two of his restaurants located several miles apart in the same city
What is the standard error of the mean in this experiment? (Round your answer to 4 decimal places.)
Mattel Corporation produces a remote-controlled car that requires three AA batteries. The mean life of these batteries in this product is 35 hours.
Calculate the standard deviation of returns for each stock and for the portfolio. Round your answers to two decimal places.
Captopril is a drug designed to lower systolic blood pressure. When subjects were tested with this drug,, their systolic blood pressure reading
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At a = .05, is a difference
To reduce operating costs, First UP Bank wants to make sure that the loan department in its branches manage the number of courier packages sent out to appraiser
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments
Ketsia is the fitness coordinator at the local youth center. She has found a program that proports to help teens lose weight if they complete the course.
The null hypothesis is that the mean price paid by younger customers (µ1) will not be as high as the price paid by older customers (µ2).
Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not
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 of 80
The amount of time a bank teller spends with each customer is normally distributed with a mean of 3.10 minutes and a standard deviation of 0.40 minutes
Mitigating barriers to black employment through affirmative action regulations: a case study Ward Thomas
Imagine that research shows the average age of people who buy lottery tickets to be 70 with a standard deviation of 12.
Interpret the t-test results. Are they statistically significant?
The managers in a company's East and West regions were rated on the basis of the company's evaluation system.
A firm is studying the production times for two production methods. The firm is satisfied with production method A and is prepared to continue
Ralston Enterprises has assets that will have a market value in one year as shown below:
From a population of cereal boxes marked "12 ounces," a sample of 16 boxes is selected and the contents of each box weighed.
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously