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Most video games have several difficulty settings, from "Easy" to "Hard" (many of these have very colorful names). A video game designer wants to determine how to structure the difficulty levels for a new game so that the average time it takes the typical player to play through "Hard" mode is longer than the time to play through "Easy" mode. A sample (Group 1) of 11 typical players took an average of 6.6 hours to complete the game on "Hard", with a standard deviation of 1.2. Another sample (Group 2) of 10 typical players took an average of 4.7 hours to complete the game on "Easy", with a standard deviation of 1. Calculate the test statistic to test the hypothesis described above, assuming the two population standard deviations are equal.
A particular candidate claims she has the support of at least 60% of the voters in her district. A random sample of 150 voters yields 87 who support her. The candidate wishes to test her claim at the 0.05 level of significance.
Dr. Justin Case wants to explore whether or not students perform better if they cram for a test (massed practice) or if they space their studying over weeks (distributed practice).
Confidence intervals for the population mean number of that color of M&Ms in a pack. You may assume that the M&M are approximately normally distributed. Which form of the formula did you use and why?
Give the regression model for predicting a person's height from his or her weight. Interms of these variables, explain what the slope of this model represents here
Use traditional hypothesis test approach. Draw a graph showing the test statistic and critical values. Assume the population has a distribution that is approximately normal and that the sample is a simple random sample.
1.a bank wants to get new customers for their credit card. they try two different approaches in their marketing
A sample of 84 golfers showed that their average score on a particular golf course was 89.05 with a standard deviation of 3.47.
Suppose that the number of accidents occurring in an industrial plant is described by a Poisson distribution with an average of one accident per month. Let x denote the time (in months) between successive accidents.a Find the probability that the ..
many teens have posted profiles on sites such as facebook and myspace. a sample survey asked random samples of teens
The following data show levels of fertilizer use (lbs) and wheat yield (bushels) on repeated trials on a six acre plot.
Sketch the distribution of Stanford -Binet IQ test scores. Write the equation that gives the z score corresponding to a Stanford-Binet IQ test score. Sketch the distribution of such z scores.
Determine r.m.s. error for regression prediction of height at 18 from height at 6.
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