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In situations for which the parameter of interest is the difference in population means for independent samples, is it necessary for the two samples sizes n1 and n2 to be equal in order for the sampling distribution of the sample statistic to be approximately normal?
If not, what condition is required for the sample sizes?
A robot travels from the lower left corner to the upper right corner of an m × n grid. It can only move right and up. How many unique paths can it take? (Hint: How many steps must any path have?)
How many voters required to be sampled to evaluate the proportion within 0.05 with 95% confidence?
Find the 95% confidence interval of the mean number of ER patients treated each day in the hospital if the standard deviation is 8 instead of 4.
The weight of a one cubic yard bag of landscape mulch is normally distributed with a mean of 40 pounds and a standard deviation of 2 pounds. What is the probability that a bag will weigh less than 40 pounds?
Some Linux distributions are set up so that a root userid is not created during the installation process. In such cases, your regular password serves as the superuser password. Why would a distribution be set up in this way? What are the advantage..
the scholastic aptitude test sat is standardized to be normally distributed with a population mean of 500. a parent is
Student determines how many minutes it would take for each method of assistance and how many points it might gain for him on the final. The method and estimates follow. Where should student seek help to be most effective?
A company wanted to know if a special gas additive truly (and significantly) affected the gas mileage in their company vehicles. Use the data below to determine whether or not the additive significantly affected gas mileage.
Is there sufficient evidence to conclude that a significant amount of improvement took place? Calculate the mean and standard deviation. Determine which test statistic applies, and calculate it.
Employees of a local university have been classified according to gender and job type.
How do the individual Ni nanowires behave under the influence of an external magnetic field? Describe what was observed.
The exercise problem the following information to figure prevalence and incidence rate:
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