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You are conducting a study on what socio-demographic factors could be behind the behavioral problems of students. You are looking at how many times a student was sent to detention. You have information on race, gender, household median income, single parent household, and whether or not the child plays sports through school or is involved in other after-class activities or clubs at the school. You run a regression. You get an F statistic of 0.001 and an R2 of 0.381. Interpret these results in terms of goodness of fit of your model. Assuming that you have access to more indicators, would you use them to improve the model? How would you know if there was an improvement if you tested to see if there is a need to use those additional indicators?
Puret grinder has required repair service according to the following distribution. Compute the mean, for the following probability distribution of the number of breakdowns per week.
Compute the value of the discriminant and give the number of real solutions to the quadratic equation
The mean lifetime of light bulbs made by this manufacturer differs from 55 months? Can we conclude that the mean lifetime of light bulbs made here differs from 55 months?
The company wants to formulate a linear programming model to determine the number of grams of each ingredient that must go into the drug in order to meet the antibiotic requirements at the minimum cost.
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
Data on distribution of cost for building effort, design work and testing effort.
According to hypothetical information, 18% of all Americans have hazel colored eyes. A SRS of 25,000 Americans are surveyed and asked about their eye color
Standard deviation of 11.6 hours. what is the 99% confidence level for the mean number of hours that the population of high school students spent working each week?
What do we know about the behavior of the sample mean ( X ) in this setting? B) If the sociologist decides to scale down his study and draw a sample of n =10.
Indicate with Yes or No whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. The 29th percentile is greater than the 30th percentile.
An economic researcher would like to know whether he can reject the null hypothesis at the 0.10 level, that no more than 20% of the households in Pennsylvania make more than $70,000 per year.
Tthe hypothesis test used (normal curve, single sample t-test, dependent samples t-test, independent samples t-test, ANOVA). For situations 1, 3, 4, and 5, also state whether the test is unilateral or bilateral.
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