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1. Test at α =.05 and 0.10 the hypothesis that a majority (more than 50%) of students favor the plus/minus grading system at a university if in a random sample of 500 students, 265 favor the system?
2. Test whether the sample evidence indicates that the average time an employee stays with a company in their current positions is less than 3 years when a random sample of 64 employees yielded a mean of 2.76 years and s = 0.8. Use a = 0.01. Assume normal distribution.
in an agency 712 of the employees are engaged in clerical work 13 of them are in supervisory work and 14 of the
After reading one of the articles chosen, write five paragraphs of five sentences summarizing the article: Use the following headings:
General scores on academic performance in english language using 60 participant. let the highest score be 90 and 10. use a class inertval of 10 create your class interval and frequency and use the information to answer.
Should that tragedy happen, the company will have to pay $15000. The company charges my father $1000 for the insurance policy. What is the expected value of this policy to my father?
Conduct Chi Square Tests of Significance for the following analysis conducted by a counselor to determine help-seeking behavior across gender and social class of the clients in his clinic. Use the five-step model of hypothesis testing for each ana..
If we randomly select a sample of 20 people from that urban location, can we determine that the distribution of the proportion of people who prefer Facebook over twitter for such samples is approximately symmetric and bell shaped? Why or Why not?
Use statistical inference to determine whether, on average, one mode of investment is better than the other.
from experience a high-jumper knows that he can clear a height of at least 1.78 meters once in 5 attempts. he also
Why are samples studied when we want to know about populations? Why are random samples used instead of just any sample? How would you determine an appropriate sample size?
according to a hospital administrator historical records over the past 10 years have shown that 20 percent of the major
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
Students arrival at a university library follows Poisson with a mean of 20 per hour. Determine the probability that there are 50 arrivals in the next I hour.
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