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For the sample of 32 lg us cities the correlation between the mean # of sq ft per office worker and the mean monthly rental rate in the central business district is the -.363 at the .05 significance level can we conclude that there is a negative association in the population between the two varaibles?
There is some concern that exposure to gases used in anesthesiology might be harming health of anesthesiologists. In one study of 525 Michigan nurse anesthesiologists, 10 reported a new malignancy other than skin cancer during the previous year.
A consumer group conducts crash test of new model cars. to determine the severity of damage to 2006 mazda 6s resulting from 10-mph crash into a concrete wall, the research group tests six cars of this type and assesses the amount of damage. descri..
NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded.
A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different.
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Correlation based on Scatter Plot - Draw the scatter plot for the variables.
Arbitrarily choose someone from sample. Determine the probability that they are Jewish and Democrat?
What is the probability that between 30 and 40 of the delinquents will commit another crime?
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
Marks on statistics midterm test are normally distributed with mean of 78 and a standard deviation of 6. Determine the probability that class of 50 has average midterm mark that is less than 75?
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