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A sample of 15 teachers from Rhode Island has an average salary of $35,270, with a standard deviation of $3256. As ample of 30 teachers from New York has an average salary of $29,512, with a standard deviation of $1432. Is there a significant difference in teacher's salaries between two states? Use a = 0.02. Find the 98% confidence interval for the difference of the two means.
Suggest a target population. Who, exactly, are the "students" in question? Suggest a choice of sampling method and comment on why you have made this choice.
How many independent network servers would be needed if each has 99 percent reliability? (b) If each has 90 percent reliability?
Based on the information above, estimate the mean and standard deviation of the weight of the pain killer in each bottle.
In a random sample of 500 families owning sets in the town was found that 340 subscribed to ASTRO. Find a 95% confidence interval for actual proportion of families in this town who subscribe to ASTRO.
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.
The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5,000, find the probability that
Month is uniformly distributed between 2 and 12. Find the probability density function and the cumulative distribution function of x.
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..
imagine you are a manager at a major bottling company. customers have begun to complain that the bottles of the brand
q1 is the gender of a nurse related to the specialty he or she chooses?? a hospital administrator counted the number of
homers pizza which predominantly delivers within the certain distance has just changed its delivery process in an
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