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1. A drug company is testing a drug intended to increase heart rate. A sample of 100 yielded a mean increase of 1.4 beats per minute, with a standard deviation known to be 3.6. Since the company wants to avoid marketing an ineffective drug, it proposes a 0.001 significance level. Should it market the drug?
2. The manufacturer of auto windows discussed in Exercise 19 of Chapter 2 has developed a new plastic material that can be applied much thinner than the conventional material. To use this material, however, the production machinery must be adjusted. A trial adjustment was made on one of the 10 machines used in production, and a sample of 25 windshields measured. This sample had a mean thickness of 2.9 mm. Using the standard deviation of 0.25 mm, does this adjustment provide for a smaller thickness in the material than the old adjustment (4 mm)? (Use a hypothesis test and level of significance of 0.01. Assume the distribution of thickness is approximately normal.)
The number of students that enroll in a psychology course is a poisson random variable with mean 100.the course incharge has decided that if the enrolling is 120 or more he will teach the course in two separate sections.
what is the major difference between the dominance criterion and other decision-making criteria under
How large a sample is needed to find the population mean within $250 at 99 percent confidence?
Determine the critical values, or cutoffs, assuming a two-tailed test with a p level of 0.05, for each of the designs described in given Exercise.
Findout the consumption level separating the bottom 45% to the top 55%. The September energy consumption levels for single family homes are found to the normally distributed with a mean
question two accounting professors decided to compare the variation of their grading procedures. to accomplish this
Construct a 90% confidence interval for the overall proportion p of adults who say that movies are getting better.
Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children.
The sensitivity of a drug test is the probability that the test will be positive when administered to a person who has actually taken the drug.
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..
Using data on average school grade for first use. Use the t test to conduct a one-tailed test of the null hypothesis, assuming that the average grade is higher for males than for females
Cramming. One Thursday, researchers gave students enrolled in a section of basic Spanish a set of 50 new vocabulary words to memorize.
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