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The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.05 level that the medicine relieves pain in more than 379 seconds. For a sample of 12 patients, the average time in which the medicine relieved pain was 387 seconds with a standard deviation of 21. Assume the population distribution is approximately normal.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- If motion pictures contain subliminal sex messages or if they challenge the traditional family, then conservative politicians ..
Random sample from population of male runners in town or city. Create and interpret the 95% confidence interval for mean, mean of the population from which sample is drawn.
hand-calculate the sample size that will be required to detect an increase or decrease of 1.5sigma from the mean of one
a researcher is interested in estimating the mean length of walleye in a lake with a 95 confidence interval. assuming
Increasing confidence level will increase width of confidence interval. This is because the fact that increasing confidence interval will increase value of z(α/2), which will increase the size of standard error (z*s/√n).
the average selling price of blackberry smart phones purchased by a random sample of 35 customers in 2010 was 311.
Would a 90% confidence interval be wider or narrower than the one that you found in that exercise? Verify your answer by computing the interval.
Which set shows the event the student gets only the 1st question correct?
Translate the following arguments into symbolic notation.- Either drivers are forbidden to send text messages, or the highways will not become safer.
The following companies are interested in conducting a market survey of their products/ services. Explain the possible sampling techniques that they might choose.
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
A computer manufacturer estimates that its line of mini- computers has, on average, 8.4 days of downtime per year. To test this claim, a researcher contacts seven companies that own one of these computers and is allowed to access company computer ..
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