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Within the school district, students were arbitarily assigned to one of two Math teachers - Mrs. Smith and Mrs. Jones. After assignment, Mrs. Smith had 30 students, and Mrs. Jones had 25 students. At end of year, each class took same standardized test. Mrs. Smith's students had average test score of 78, with standard deviation of 10; and Mrs. Jones' students had average test score of 85, with standard deviation of 15. Test hypothesis that Mrs. Smith and Mrs. Jones are equally effective teachers. Use 0.10 level of significance. (Suppose that student performance is approximately normal.)
Research the topic of Job Satisfaction and provide a 1 page write-up of the research highlighting where statistical analysis is being used and why it's used.
Find out correlation coefficient r, If student take 35 minutes to complete exam, what is his predicted score.
Suppose that among all participants, the mean test score is 70.07 and the standard deviation is 10.27. Use z-scores to interpret a raw score of 80. What is the corresponding z-score? How would you interpret this result? Show your work.
According to the Insurance Institute of America, a family of four spends between $400 and $3800 per year on all types of insurance. Suppose the money spent is uniformly distributed between these amounts.
Within distribution of scores, measures of dispersion give an indication of?
Model Fitness. With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
Team Marketing Report, a sports-business newsletter, estimates that the average total cost for a family of four to attend a major league baseball game is $132.
Given a sample size of 9,245, a sample mean of 38, a standard deviation of 8.15, and a confidence level of 97%, calculate the lower bound of the confidence interval.
The probability that Traci Muldone will die during the 10-year term of a life insurance policy is assessed by the insurance company at 1/5. Arthur Average's probability of living to the end of the 10-year period is reckoned at 95%
The standard deviation of the sample is $3,000. Interpret your findings.
Write down the name of 4 parts of the regression equation.
When the purpose of sampling is to detect when a process becomes too variable the chart of choice will be a c-chart?
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