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A standad deviation of $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
This sample is relatively more weighted towards the rst stratum where almost 20% of the stratum was sampled compared to the second stratum where only 2% of the stratum was sampled. Will this phenom
find the 90% confidence interval for the standard deviation for the time it takes an inspector to check a bus for safety if a sample of 27 buses has a standard deviation of 6.8 minutes.
State the hypotheses to see if there was a difference. Obtain a test statistic and p-value. Why might there be a difference between morning and afternoon scores? Explain.
What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50?
How do we answer a question like: Find the 5th percentile of height in the adult US male population, i.e. what height is associated with the shortest 5% of the population?
A bowl contains 20 chips, of which 9 are red, 8 are white and 3 are blue. Six chips are taken at random and without replacement. Find the probability that
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI of 30 or more is considered obese. What proportion of children are obese?
Write the stems vertically in increasing order from top to bottom, and draw a vertical line to the right of the stems. Go through the data, writing each leaf to the right of its stem. Write the ste
The "t-statistic" for testing whether the slope parameter was unity or not was -3.6. What is the estimated standard error for the estimated slope coefficient?
If the inspection position is eleminated, defects will go into product assembly and will have to be replaced later at a cost of $10 each when they are detected in finnal product testing.
What is the probability that half of them will develop diabetes? b) What is the probability that none will develop diabetes?
An investment counselor would like to meet with 12 of his clients on Monday, but he has time for only 8 appointments. How many different combinations of the clients could be considered for inclusion
The number of seeds that germinated within 5 weeks after planting was recorded for each seed type. At the .01 level of significance, is the proportion of seeds that germinate dependent on the seed t
Suppose we have n pairs (x,y) If a scatterplot of the data suggests a general linear trend, it would be reasonable to fit a line to the data The question is which is the best line?
At the .01 level of significance, do these data support the conclusion that the ferritin distribution in elderly men has a smaller variance than in younger men?
A variety of pea plants producing yellow (y) owers with round (r) pollens are crossed with plants that produce green (g) owers with wrinkled (w) pollens. According to Mendelian theory of heredity, 9
The population standard deviation was 1.68 years. Using the 99% degree of confidence, what is the confidence interval for the population mean.
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? (b) Why might a
People with MBAs often get promoted faster than people without the degree. Prepare a 92% confidence interval estimate for the population proportion.
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
Brain Tumor Survival A study is conducted to compare the quality of the neurosurgical staff at each of three hospitals in the same city. The researchers examine the records of patients who were oper
what is the probability that at most 3 of the 6 seeds that were planted will germinate? Round your answer to four decimal places.
What would be the cutoff score for selecting the top 10% of applicants, assuming that the standardized test is normally distributed?
Big brother is probably already listening... For some reason, my posts never make the digest. Shouldn"t say never, two have made it from maybe twenty. This one makes it, Does anyone know what the p