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The original concepts of analysis of variance came from the work of Sir Ronald A. Fisher, an English statistician. This technique, better known as ANOVA, has become one of the most commonly used research methods for testing differences among several population means. If only two populations are in question, ANOVA can be used; however, a two-sample t test would be much easier to test for equality of two population means.
Now suppose five populations are in question. If the two-sample t test were used, we would need to test ten possible combinations (five items taken two at a time). This would be possible; however, if we chose ? = 0.05 for each test, this means the probability of committing a Type I error in any particular test is 0.05. What can we conclude about the hypothesis that all means are equal if each of the ten individual tests has a 0.05 probability of a Type I error?
CPI and Subway Fare Find the best predicted cost of subway fare when the consumer Price Index (CPI) is 182.5 (in the year 2000).
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be
Hypothesis test for two factors ANOVA. Describe what thses represent and, based on figure, whether there is a problem with the data r otherwise.
Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
What the information do z-scores give that actual heights do no?
What is the probability the number of fatal crashes will be between 1000 and 2000 for a year?
A sociologist wants to describe if the life expectancy of people in Africa is lesser than the life expectancy of people in Asia.
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
A test was conducted to find out whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at trade show employing a female spokesperson determined that 70 out of 150 customers prefe..
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
The rejection region for a two-tail test that uses the standard normal distribution is that area under the distribution lying
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