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A large school district notices that about 15% of its students drop out of school. A company suggests the district try its new technology software designed to improve student motivation in the high school curriculum and, thus, lower the dropout rate. The new technology software is quite expensive, so the company offers a free, one-year trial period to determine whether the dropout rate decreases. If it works, the school district will pay for continued use of the software. What would happen if the school district makes a Type II error?
What is the probability that all 5 are basketball players? If the players are to be arranged in a line, how many arrangements are there if the basketball players are together?
Suppose that seven balls are selected at random without replacement from a box containing five red balls and ten blue balls.
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
A box contains 6 red and 9 green marbles. You reach in and remove 3 marbles all at once. (a) Find the probability that these 3 marbles are all red. (Enter your answer as a fraction.)
What are the lower-limit and the upper-limit of the 90% two-sided confidence interval?
If I have unnormal data with n=15, and there are 2 samples. What test do I use? How do I make the data normal if the samples contain zero, b/c it's measuring time?
What is Goldberg's rationale for the study? Was the study designed to contribute to theory? Do the results of the study contribute to theory? For both questions: If so, how? If not, why not?
In forecasting, MacDonald's Wing® discovered that when it opened its store to the public, it was able to sell 5,000 parachutes in the first year. Given the equation; y=a+bx. Where ‘y' represents the number of sales and ‘a' is the number they start..
Compute SS, variance, and standard deviation for following population of N = 7.Scores: 8, 1, 4, 3, 5, 3, and 4. The definitional formula works well with these scores. Use the definitional formula to compute SS.
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
The article "Statistical Behavior Modeling for DriverAdaptive Precrash Systems" (IEEE Trans. on Intelligent Transp. Systems, 2013: 1-9) proposed the following mixture of two exponential distributions for modeling the behavior of what the authors c..
Find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
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