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A study was undertaken to evaluate the use of magnetic resonance imaging (MRI) in the diagnosis of lumbar disk herniation. One hundred patients with lumbar disk herniation confirmed by surgery were evaluated with MRI, as were 100 patients without herniation. The MRI results were positive in 80 of the patients with herniation and in 20 of the patients without herniation. MRI is used in a patient who has a 25% chance of having a herniated lumbar disk, according to the patient's history and physical examination. What are the chances of herniation if the MRI is positive?
a. 35%
b. 57%
c. 73%
d. 80%
e. 92%
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
To forecast attendance at an yearly tennis tournament a model has been developed that uses attendance from the previous year and the amount spent for advertising this year.
Solve different inventory control problems using an appropriate OR method.
We are interested in determining if the accident proportions differ between the two age groups:
Find out equation of the line of best fit. Find out r - Is there a strong relationship?
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
A random sample of 36 days yielded the average daily output of 890.2 tons, with standard deviation of 19.8 tons. Use this information to make a 95% confidence interval for mean.
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
Confirm that these statements are accurate by finding the geometric mean rate of increase.
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