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Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses both the claim and the significance level alpha. Use the P-value method.
1. A certain drug is used to treat asthma. In a clinical trial of the drug, 25 of 256 treated subjects experienced headaches (based on data from the manufacturer). Use a .01 level of significance to test the claim that less than 11% of treated subjects experienced headaches. Use the normal distribution as an approximation to the binomial distribution.
Dr. Richmond, a psychologist, is studying the daytime television viewing habits of college students.
During 2008, college work-study students earned a mean of $1478. Assume that a sample consisting of 45 of the work-study students at a large university was found to have earned a mean of $1503 during that year
The reason sample variance has a divisor of n-1 rather than n is that it makes the sample standard deviation an unbiased estimate of the population standard deviation.
Parameter of interest is mean score in this population. Sample is an SRS of size n = 4 drawn from population. Determine the mean of 10 scores in the population.
a spymaster has a network of 7 operatives whom he pays out of a slush fund containing 20000. for accounting reasons his
The class average on a statistics test is 65 marks with a standard deviation of 10 marks. What minimum mark must a student obtain to be in the top 11%
almost all medical schools in the united states require applicants to take the medical college admission test mcat. on
The required return on this low-risk stock is 9.00%. What is the best estimate of the stock's current market value?
Use a simple regression model to test the null hypothesis against the alternative
Find the probability that you (a) make your first sale on the fifth call, (b) make your first sale on the first
A survey by the AARP (Money, June 2007) reported that approximately 70% of people in the 50 to 64 age bracket have tried some type of alternative therapy (for instance, acupuncture or the use of nutrition supplements). Assume this survey was based..
1 in a two-tailed hypothesis test the test statistic is determined to be z -2.5. the p-value for this test why?a is
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