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An educational researcher is interested in comparing the reading skills of children in three schoos systems. Inner City, Suburban, and Rural. A random sample of 4 children from each system provided the following reading scores:
Inner City--79-84-74-93Suburban--90-84-87-95Rural--79-73-67-78
Assume the samples comes from normal populations with equal variances.
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is. The test had a mean of 110 and a σ of 12.
Is there a relationship between sales and newspaper?
Two t-curves have degrees of freedom 12 and 20, respectively. Which one more closely resembles the standard normal curve? Explain your answer.
Identify the scale of measurement in each of the following:
An apple juice producer buys all his apples from a conglomerate of apple growers in one northwest state. The amount of juice squeezed from each of these apples
In certain normal distribution of scores, mean is 50 and standard deviation is 4. Determine z-score corresponding to a score of 55.
Find the average age at which people will experience their first cardiac incident, given that 17% of all initial cardiac incident victims are younger than 50. Please, interpret the result.
Mark makes it a policy not to buy bananas unless the price is 33 cents or less per pound. What proportion of the time would he buy bananas?
how many chocolate chip cookies will he need to sample to estimate the mean to within 2, what is a 99% confidence interval for the average number of chips per cookie?
What is the 99% confidence interval?
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
Test hypothesis that Site B is more successful in initiating acquaintances than Site A. Use alpha = .05.
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