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Question: One sample of 16 third-graders had been taught to read by the "look-say" method. A second sample of 18 had been taught by the phonics method. Both were given a reading achievement test, and a Mann-Whitney U test was performed on the results. The U value was 51.
Make a stem and leaf graph of the first five rows of the blood cholesterol data in Table (50 observations). Do you see an excess of 0's or 5's?
Apply an appropriate hypothesis test and the 0.05 level of significance in determining whether the region should be considered as having a burglary problem greater than that for the nation as a whole.
Some of the methods in this section are approximations rather than exact probability results. We have given rules of thumb for safe use of these approximations.
ethical behavior of business students at rocky universityduring the global recession of 2008 and 2009 there were many
If 1 adult male is randomly selected and is assumed to have 20 pounds of carry-on baggage, find the probability that his total is greater than 195 pounds. Round your answer to three decimal places.
8.175 How much power does this study have to detect a mean difference of 5 units in the symptom scale if a two sided test is used with α = .05?
An investment project is expected to earn $100,000 on average with a standard deviation of $50,000. Assume earnings from this investment project is a normal distribution. Of the next 15 people that invest in this project, what is the probability t..
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
In a test of the reliability of products produced by two machines, machine 1 produced 10 defective parts in a run of 200, while machine 2 produced 15 defective parts in a run of 260. Test the claim that proportion of defectives produced by machine..
We will examine the association between the weight of the car (in thousand of pounds) and the fuel efficiency (in miles per gallon). Shown is the regression output.
Males had a mean cholesterol level of 195 and a standard deviation of 10. If the campus was equally divided between males and females, how many males on this campus would be at increased risk?
suppose that a hypothesis test is performed at a small significance level. state the appropriate conclusion in each
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