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A set of data items is normally distributed with a mean of 108 and a standard deviation of 19. Convert each of the following data items to a z-score. Round your answer to the nearest hundredth.
(a) 249 Z= (b) 77 Z=
If you have studied the central limit theorem, find the margins of error associated with a chance of .90 and a chance of .95. Compare these values with those calculated in step 2.
Do teachers find their work rewarding and satisfying? An article reports the results of a survey of 398 elementary school teachers and 262 high school teachers
The ages of subscribers to a certain newspaper are normally distributed with mean 35.5 years and standard deviation 4.8. What is the probability
What is the probability that the second train selected is at least 2 mins later than the first subway train selected?
a random sample of 25 lunch orders at noodles and company showed a mean bill of 10.36 with a asample standard deviation
Please note the following definitions: The prevalence of a disease is the proportion of individuals in a population or subpopulation who have a disease.
Universities and colleges do not like to admit students who do not perform well. It is expensive and unpleasant for both the student and the school. Since you work in the Department of Education and are a trained statistician, your supervisor has ask..
it is desired to estimate the mean ldl level of healthy males in the state of ohio at the 99 confidence level to within
desrcribe situations where a normal distribution provides a good approximatioon of the sampling distribution of the
why is it so important to periodically take a physical inventory when using a perpetual inventory system? does the
The viewers' satisfaction ratings are recorded. The results are analyzed via twofactor ANOVA, one factor being network and the other factor being news time. Complete the following ANOVA table for this study, and give a full interpretation of the r..
Assume that the population is normally distributed. Can we conclude at the 0.01 level of significance that the mean waiting time on special orders at this furniture store exceeds 28 days? Perform a one-tailed test.
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