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A social worker randomly selects 28 households with children. He finds a correlation coefficient of -0.21 between average weekly work hours of the parents and the happiness index of the children in that household. Is this correlation statistically significant? He also found the regression coefficient to be -1.66. Is this regression coefficient statistically significant? Explain why or why not for each.
Which of the following statements is not true of the null hypothesis? A) It is your theory B) It is what you would expect by chance alone C) Assumes things to be equal D) None of the above
If a technical breakthrough occurred that raised the profit per unit of X 1 to $3, would this affect the optimal solution?
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each loation.
Find Probability of independent events.Consider again the auto repair rates described. If you own two cars, what is the probability that.
Do the data demonstrate that the true mean photometer reading for the color density is significantly different from 12 at 3 percent level of significance?
1) There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. a) Determine the standard error of the proportion.
Sample mean varies from population mean of 10 pounds at 5 percent level of significance using two-tailed test. Compute test statistic for the sample data.
If employee is chosen at random, determine these probabilities.The Employee smokes, The employees smokes, given that he/she graduated from college.
Use a 0.05 significance level to test the claim that king-size cigarettes with filters have a lower mean amount of nicotine than the mean amount of nicotine in non-filtered king-size cigarettes.
A GSS asked. "What do you think is the ideal number of children for a family to have? the 497 female who responded had a median of 2, mean of 3.02 and standard deviation of 1.81 (a) Report the point estimate of the population mean.
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
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