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A sample of 250 adults tried the new multigrain cereal "Wow!" A total of 187 rated it as excellent. In a sample of 100 children, 66 rated it as excellent. Using the 0.1 significance level, the researcher wishes to show that adults like the cereal better than children. What is the pooled proportion?
.723
1.408
.494
.807
A company is researching the effectiveness of a new website design to decrease the time to access a website. Five website users were randomly selected, and their times (in seconds) to access the website with the old and new designs were recorded. To compare the times, they computed (new website design time - old website design time). The results follow.
user Old web design New web designA 30 25B 45 30C 25 20
D 32 30
E 28 27What is the value of the test statistic?
2.256
1.895
3.747
2.447
Suppose that scores on the Math SAT exam follow a Normal distribution with mean 500 and standard deviation 100. Two students that have taken the exam are selected at random. What is the probability that the sum of their scores exceeds 1200?
In publishing the results of some research work, the following values of the coefficient of determination were listed. Which one would appear to be incorrect?
Write the null hypothesis in mathematical form; and in plain English. Write the alternative hypothesis in mathematical form; and in plain English. State the model assumption(s) and assess them.
Find the best-predicted value of y given
1. Discuss the following concepts and give examples from everyday life in which you might encounter each concept. Hint: For instance, consider the experiment of arriving for class. Some possible outcomes are not arriving (missing class), arriving on ..
Ebola Test Kit Evaluation
A friend has offered to play a gambling game with you that involves flipping a coin that he has provided. Since a flip of heads will be to his advantage, you want to test the coin for fairness before you begin to play. Your friend is willing to..
1. The power of the t test increases with ____.2. Having just made what you feel is to be a Type II error, using an independent groups design and a t test analysis, which of the following might you do in the next experiment to reduce the probability ..
State a research question for which a single-group post-test only design can yield relatively unambiguous findings.
If a Pie Chart were constructed for the weights of the salmon, what would be the measure of the central angle for the class weighing 200-249 grams?
Suppose Ana has a pair of dice (the traditional six-sided kind). Let X= the difference of the largest minus the smallest number showing on the dice. Find the PMF for X.
Perspective about the problem you are trying to analyze; in other words, you should review the literature concerning your subject. The library or the web will be a good source of information.
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