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As part of a large ongoing study on the treatment of women with breast cancer, the treatment time (in months) of eight patients who were cancer free is recorded. They are: 9.47 8.60 19.33 16.33 8.5 9.40 17.67 19.30 What are the degrees of freedom for testing that the mean disease-free time is greater than 0?
Determine the values of mean M and standard deviation s for original sample?
an agricultural field trial compares the yield of two varieties of corn. the researchers divide in half each of 14
A telescpoe manufacturur wants its telescopes to have standard deviations in resolution to be significantly below 2 when focusing on objects 500 light-years away.
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
Assume that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices.
For the control group, the mean was 70.3 and the standard deviation was 8.3. (a) Do beta-blockers reduce the pulse rate? State the hypotheses and do a t test.
What is the degree of correlation between the dependent variable and the independent variable? Is the statistical significance of the model as a whole less than the desired statistical significance for the regression model? Explain the basis for yo..
write up answers 1-2 pages in length to each of the following.1. the essential components of hypothesis testing are the
it is found that when a particular 4-sided die is rolled a 1 occurs 26.9 of the time a 2 occurs 23.8 of the time a 3
Certain tubes manufactured by a company have a mean life of 800 hours and standard deviation of 60 hours. Find the probability that a random sample of 16 tubes taken from the group will have a mean life of?
the average power of a generic drug used for the common cold should be 5.0 0.1 mg cc so that it can be sold in
An environmentalist estimate that the mean waste recycle by adults in the country is more than 1 pound per person per day. You want to test this claim, you find that the mean waste recycled per person per day for a random sample of adults in the c..
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