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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.
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
Explain why it might be important to look at cancer incidence that is age-adjusted rather than just cancer incidence. Perform simple linear regression on these data and report your finding.
What is the approximate estimated bootstrap standard error of the median, What is the approximate bias of the median estimated from bootstrapping - What is the bootstrap t confidence interval for the median
What is the rejection point at α = .10 and indicate if you would accept or reject H o ?
The mean height of a certain plant is 160 centimeters. Suppose a botanist wants to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 160. What is the null hypothesis and the al..
Robinson & Associates performs employment screening for large companies in southern California. It usually follows two-step process. First potential applicants are given a test that covers basic knowledge and intelligence. If applicants score b..
At some vacation destinations, "all-inclusive" resorts allow you to pay a flat rate and then eat and drink as much as you want. There has been concern about whether these deals might lead to excessive consumption of alcohol by young adults on spri..
The heights of north American women are normally distributed with a mean of 64 inches and a standard deviation of 2 inches.
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
A processor of carrots cuts green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test weight of the boxes, a few were checked.
Create a set of n observations from the binomial distribution with 1 trial and the event probability of 0.007, where n is your answer.
Critically illustrate out the range? What is the arithmetic mean income? What is the population variance?
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