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A medical researcher wants to determine whether there is a difference in the mean length of time it takes three types of pain relievers to provide relief from headache pain. Several headache sufferers are randomly selected and given one of the three medications. Each headache sufferer records the time (in minutes) it takes the medication to begin working. The results are shown in the table. At a significance level of 0.01, can you conclude that the mean times are different? Assume each population of relief times is normally distributed and that the population variances are equal.
A "random survey" was conducted of 3274 people of the "microprocessor generation" (people born since 1971, the year the microprocessor were invented). It was reported that 48% of those
The distribution is normal. The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown
in 2006 merck released a vaccine named gardasil for hpv - the most common cause of cervical cancer among young women.
You may assume the sample data comes from a population that follows a normal distribution. Using a .05 level of significance test the company's claim.
list some of the risks in using samples to make inferences about populations from which the samples were drawn. what
Define what a hypothesis is and discuss the relationship between hypothesis testing and statistics. Discuss what independent and dependent variables are in an experiment, state the relationship between the two and give an example.
A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
a study was conducted to determine whether persons in suburban district ii have a lower mean income than those in
a basketball team has 5 players more than 6 feet tall and 6 who are less than 6 feet tell. how many ways can they have
an average computer mouse inspector can inspect 55 mice per hour with a population standard deviation of 14 mice per
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