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In multiple regression with 4 explanatory variables, data are gathered on 25 observations. Determine the largest value the ANOVA F statistic can take on before we would reject the null hypothesis th
Public Opinion reported that the 5% of Americans are afraid of being alone in house at the night. If random sample of 20 Americans is selected, determine the following probabilities:
For each week an English household generates an average of 28 lbs of garbage. Assume the distribution is normal and the standard deviation is 2 lbs. If a household is selected at random, find the pr
A randomized comparative experiment compared effects of two types of deep-brain stimulation (pallidal stimulation and subthalamic stimulation) on change in motor function, as blindly assessed on the
Determine the coefficient of correlation between the two variables. (Round your answer to 3 decimal places.) State the decision rule for 0.1 significance level: H0: ? ? 0; H1: ? > 0 (Round your ans
As the sample size gets larger, the size of correlation necessary for significance ____
Can you explain in detail please? Can you explain in detail please?
A quality control program is being developed for batteries. The percent defective for such in the past has been 3%. If sample size of 120 is taken, what would the 99.7% upper control chart limit be?
Defects in computer hard-drives will usually render the whole computer worthless. For a specific model, the percent defective in the past has been 1%. If sample size of 400 is taken, what would the
In an interview counselor notes a significant reduce in symptoms in patients who have been treated for depression. He calculates the effect size based upon his data, and finds out that d=-.67. Based
A treatment facility tests new group therapy for patients with self-destructive behaviors. The therapists hope to decrease scores on a measure of self-destructive behaviors that has a mean in the ov
A psychologist is planning to study effect of anger management on aggressive behavior of students at her high school. The mean number of aggressive behaviors is 14 pr.
Claim that tutoring package will improve test scores by at least 25 points. We decide to test the theory. We gather 10 students willing to participate in the program. We want to predict the effect s
In order for linear programming problem to have a unique solution, the solution must exist
Which of the following points (X,Y) is not a feasible corner point?
Consider the following linear programming problem:
Infeasibility in a linear programming problem occurs when
Find out the probability that the sample of 49 boxes will have a mean weight below 365 grams. Past records show that population mean is 368 grams and population standard deviation is 7. The probabil
He guesses that she is probably doing a survey regarding a political cause. Cynthia asks her first question, "how significant is the environment to you"? In this scenario, we clearly need to be worr
Let x be a random variable representing dividend yield of the Australian bank stocks. We may suppose that x has normal distribution with ? = 2.6%.
At the .10 significance level, can we conclude that there is difference in the length of time the two kinds of treatment lasted? The degrees of freedom is __________. (Round down your answer to neares
Benford's Law claims that numbers selected from very large data files tend to have "1" as the first nonzero digit disproportionately often. In fact, research has shown that if you randomly draw numb
The area not comprising right tail of the standard normal curve. The area not comprising left tail of the standard normal curve. The area in the left tail of standard normal curve.
The coefficient of determination of a set of data points is 0.83 and the slope of the regression line is -1.38. Determine the linear correlation coefficient of the data.
Assume that in the year 2000, the cost of compact car averaged $ 12500 and that in 2003, the cost averaged $ 14300. Supposing that the relationship between year t and cost c is linear, develop a for