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The Tampa Bay (FLA) Area Chamber of Commerce wished to know whether mean weekly salary of nurses was larger than that of school teachers. It is thought that historic variances of each groups weekly salary are not same. To investigate, they gathered salary information on amounts earned last week by sample of school teachers and nurses. Data can be found on our Excel worksheet.
Is it sensible to conclude that mean weekly salary of school teachers is lower at .05 level of significance? Explain why?
Are two groups significantly different at .05 level of significance? Describe how you arrived at this conclusion.
Assume you want to estimate the population proportion,p, and the estimator for the mean proportion (p-hat)= 0.34, N = 6000, and n = 1300. Find an approximate 95% confidence interval for p.
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 500 and a population standard deviation of 6 and a sample size of 18.
The hypotheses for this scenario are as follows: Null Hypothesis: μ ≤ 21.61, Alternative Hypothesis: μ > 21.61. You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.0095. What is the appropriate concl..
Suppose the horses in a large stable have a mean weight of 1464 lbs, and a standard deviation of 111. What is the probability that the mean weight of the sample horses would differ from the population mean by less than 11 lbs if 34 horses are samp..
Dana and Cathy are playing tennis. The probability that Dana wins at least one out of two ames is 0.3. What is the probability that Dana wins at least one out of four?
It is interested in estimating a 99.97% worst case for percentage of loan that defaults on the portfolio. Show how this varies with the copula correlation.
Create a scatter plot for the data. Determine the correlation coefficient for the data.
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim.
The production department wants to explore the relationship between the number of employees who assemble a subassembly and the number produced. The complete set of paired observations follows:
Suppose Z has a standard normal distribution with a mean of 0 and standard deviation of 1. The probability that Z is less than -2.20 is.
Following data represent random sample of bank balances for population of checking account customers at large eastern bank. Based on data, determine the 95 percent confidence interval estimate for true population mean?
I have a problem that wants to know the sample size of Illinois republican voters, they want to know the sample size with 95% confidence and 3% margin of error, not sure how to get started.
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