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Environmental health indicators include air quality, water quality, and food quality. Twenty-five years ago, 47% of U.S. food samples contained pesticide residues. In a recent study, 44 of 125 food samples contained pesticide residues.
a. State the hypotheses that can be used to show that the population proportion declined.
b. What is the sample proportion?
c. What is the p-value?
d. Use a = .01. What is your conclusion?
Form a frequency distribution and a percentage distribution that have class intervals with the upper class limits $99, $119, and so on.
Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why.
A statistic practitioner working for Major League Baseball determined the probability that the hitter will be out on ground balls is .75. in a game where there are 20 ground balls, find the probability that all of them were out.
Which of the following would be most helpful in assessing the practical significance of a test of hypotheses about a proportion?
Motorola used the normal distribution to determine the probability of defects and the number of defects expected in a production process.
In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
A psychiatrist hires you to study whether her clients self-disclosed more while sitting in an easy chair or lying down on a couch. All clients had previously agreed to allow the sessions to be videotaped for research purposes.
The following frequency distribution reports electricity cost for sample of 50 two-bedroom apartments in Albuquerque, New Mexico during the month of May last year.
The following data represents the running time of films produced by 2 motion picture companies. Assume these are independent samples
For the first test, assume the data are from an independent-measures study using two separate samples.
Suppose that an automobile manufacturer designed a radically new lightweight engine and wants to recommend the grade of gasoline to use.
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