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Families USA, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979. The standard deviation of the sample was $1.000.
a) Based on this sample information, develop a 90 percent confidence interval for the population mean yearly premium.
b) How large a sample is needed to find the population mean within $250 at 99 percent confidence?
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
Make for more scatter plots comparing GDP growth 1970-2000 to corruption, political rights, rule of law, and socio-political instability
Compute mean and standard deviation for sample of N = 8 females and sample of N = 8 for males.
What is the equation for this regression model?
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
What happens to the probability of getting exactly 50% heads?
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
Given that P (A) = 0.7, P (B) = 0.5, and P (A B) = 0.8. Find the following probabilities:
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
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