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A researcher believes exercise reduces anxiety in women. She identifies a group of women who had not exercised before but are now planning to begin exercising. She gives them a 50-item anxiety inventory before they begin exercising and administers it again after 6 months of exercising. The anxiety inventory is measured on an interval scale and higher numbers indicate higher anxiety. In addition, scores on the inventory are normally distributed. The scores appear below.
Before After 46, 44 41, 40 42, 39 47, 46 43, 42 45, 43
a) What statistical test should be used to analyze these data? b) Identify Ho and Ha for this study. c) Conduct the appropriate analysis. d) Should Ho be rejected? What should the researcher conclude? e) If significant, compute the effect size and interpret this.
Statistical Testing for an Out-of-Control Process, A statistical process analyst is responsible for assuring statistical control. In one process, a machine is supposed to drop 11.4 ounces of mints into a bag.
Find the Fourier series expansions of f(x) = Co + C1x^2 with respect to the following two orthonormal bases on the interval [0,L] (L>0)
Let G be the group of symmetries of a cube, including the orientation-reversing symmetries. Describe the elements of G geometrically.
Find the velocity of the top of the ladder at time t=2.
Please evaluate the following integral using the formula for integration by parts,
When a student is taught how to find the mean of a set of data, why might the child have a difficult time accepting the answer? Please explain in details and give example.
Explain why a decision maker might feel uncomfortable with the expected value approach, and decide to use a non-probabilistic approach even when probabilities are available.
The trigonometric function to find exact value.
Suppose that 45 workers in a textile mill are selected at randome in a study of accident rate. the number of accidents per worker is assumed to be Poisson distributed with mean u . The average number of accidents per worker is 1.7.
Probability of a Bullseye, A simple dartboard has three areas - the main board has a radius of 10 inches, there is a circle with a radius of 5 inches, and the bullseye has a radius of 2 inches
Use the given information to draw the graph of f(x) on an interval near the indicated point (x=3). If there is not enough information given, then state this fact.
Which of the participants would you judge to be capable? Explain
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