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Reading comprehension test scores of elementary school children randomly assigned to one of two teaching methods have the following randomly assigned to one of two teaching methods have the following summary statistics:
# of Children Mean Standard Deviation
Method 1 13 64 5
Method 2 13 69 8
We would like to conduct a hypothesis test to determine whether the true mean test score differs for the two teaching methods. Suppose that all necessary assumptions have been satisfied.
What type of test should be used?
a. pooled independent two-sample t test
b. matched pairs t test
c. unpooled (conservative) independent two-sample t test.
The investigator wants to estimate the average gain in strength due to the training program. Does this comparison involve paired data or data from two independent samples?
suppose the average cholesterol level of children ages 2-14 is 175 mgdl with a standard deviation 30 mgdl. recently
Problem: Overweight? Although the rules of probability are just basic facts about percents or proportions, we need to be able to use the language of events and their probabilities. Choose an American adult at random. Define two events:
When you are doing a two-tailed test and find the p-value associated with your z statistic, you have to multiply the p value by 2.
Last year Galaxy Corp had $350,000 of assets (which is equal to its total invested capital), $475,000 of sales, $30,250 of net income, and a debt-to-capital rat
A Gallup Organization poll of n = 1004 randomly selected American adults in July 2002 found that 55% of those surveyed felt that their weight was about right.
What is the difference between the mean and the median and which would you report if you had a skewed set of data to describe the central tendency?
Each of the given graphs shows the probability distribution for two statistics that could be used to estimate a parameter u. Select the statistic that would be a better estimator of u and justify your answer.
the number of unhealthy days based on the aqi air quality index for a random sample of metropolitan areas is shown.
a company is criticized because only 17 of 48 executives at a local branch are women. the company explains that
What is the difference (if any) between the Wilcoxon rank-sum test and the Mann-Whitney U test?
Two cards are drawn without replacement from a wellshuffled deck of 52 playing cards.
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