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Test the claim that the mean age of people in the United States who would say yes to the survey question shown in the table is 60 years or older. Use a = 0.10 and assume that the population is normally distributed. Write a paragraph that interprets the test's decision.
Compute the two weights that give the cutoff points for the three categories.
Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees and a standard deviation of 1 degrees C.
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
If the distribution of movie admission charges is approximately normal with a standard deviation of $ 0.89 . What is the probability that a randomly selected admission charge is between 6 and 8.2 dollars?
Determine the probability of a positive economic trend given an increasing employment. Are employment and economic trend independent?
The study compared the number of Hm-2 gene mutations in each group. The data table is below.
What is the null and alternative hypothesis? What is your final conclusion?
A professor wants to determine if his class' anxiety decreases over the course of the semester. He uses a test to measure a random sample of all students enrolled at midterm and again at the end of the course.
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
Residents of Mill River have fond memories of ice skating at a local park. An artist has captured the experience in a drawing and is hoping to reproduce it and sell framed copies to current and former residents.
Unexposed women comprising a contro group. at the 0.01 level of significance, was the incidence of cancer greater in the DES users?
Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
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