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The National Center for Health Statistics reports that the mean systolic blood pressure for males 3 to 44 years of age is 128, and the standard deviation in this population is 15. The medical director of a large company looks at the medical records of 72 executives in this age group and finds that the mean systolic blood pressure in this sample is 126.07. Is this evidence that the company's executives have a different mean blood pressure from the general population?
Write out the null and the alternative hypothesis.
What is the appropriate data analysis method for this study?
Calculate the test statistic and effect size.
Make the decision, and explain why.
The data was used to make inferences regarding the other students taking the course. Construct a 95% confidence interval estimate. Explain your findings so that your non-quantitative partner will understand them. Their data is below:
researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory.to test this claim a
What is the R and adjusted R-square for all independent variables entered simultaneously and what variables provide a significant unique contribution(s)?
there are 8 cds in a rack 5 are jazz and 3 are classic rock. two cds are selected at random one after the other with
Airline were reunited with the missing items by the next day. Does this cast doubt on the airline's claim? Use a calculator to find z-scores and P-values. Reject the null if P-value
Let z be a standard normal random variable and calculate the following probabilities:
How many participants must be enrolled in the study? Assume that the standard deviation of total cholesterol is 18.5.
The following table presents data on political party affiliation and class level for sample of students in certain university: If the student is selected at random from sample, determine the probability that student is Republican.
let y be a uniform random variable defined over the interval 02. find an expression for the rth moment of y about the
assume that a procedure yields a binomial distribution with a trial repeated n times. use the binomial probabilities
Suppose that an IQ test was given to a large group of persons, the scores are assumed to be from a normally distributed population, that mean = 100 and s (standard deviation) = 15.
What is the probability that a randomly selected item from the production will weigh at least 4.14 ounces (to 4 decimals)?
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