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The mean score for freshman on an aptitude test at a certain college is 800 with a standard deviation of 50. That is the probability that two groups of students selected at random, consisting of 36 and 49 students, respectively, will differ in their mean scores by: (Assume mean scores are continuous)
a) more than 12 points?
b) an amount between 7 and 15 points?
The professor listed the answers to be:
a) 13.7%
b) 17.6%
What terms describe the fit of a regression equation to the data? What is the practical use of the regression equation in the real world? Explain with some examples.
Let μ be the mean perceived age estimate for all viewers of the ad, and suppose we consider the industry requirement to be met if μ is at least 25. Set up the null and alternative hypotheses needed to attempt to show that the industry requirement ..
Compare a three-month moving average forecast with an exponential smoothing fore-cast for a = 0.2. Which provides the better forecasts using MSE as the measure of model accuracy?
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
Which of the following is true about the expected value of perfect information. It is the amount you would pay for any sample study.
If we were to ask three people at arbitrary, determine the probability that they will all prefer punk rock?
Anthony is measuring his participants' emotional states in two different ways (self-report and galvanic skin response) in order to gain a greater confidence that he is actually measuring the emotional that he thinks he is.
Create the corresponding decision tree and make recommendations.
If you have n independent flips of a coin with probability p of landing heads. And a changeover occurs whenever an outcome differs from the one preceding it.
A survey of 10 different suburbs in Dallas Texas found the average gasoline to be $ 1.294 a gallon with a standard deviation of $ .0526. What is the critical value using a=.05 and what is the test value.
Would the null hypothesis that the 2007 median household income was $50,000 be rejected at the 10% significance level in favor of the two-sided alternative? (Choose the correct answer)
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
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