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Question:
A doctor wants to estimate the HDL. How many subjects are needed to estimate the HDL within 3 points with a 99% confidence. Assuming s=13.9
What are the differences between a two sample t-test and ANOVA hypothesis testing? When would you use ANOVA at your place of employment, in your education, or in politics?
A researcher used stepwise regression to create regression models to predict BirthRate (births per 1,000) using five predictors: LifeExp (life expectancy in years), InfMort (infant mortality rate).
Calculate the probability that a randomly chosen sample of 17 games would have a sample mean less than the one you calculated in this exam. Use the standard normal distribution.
They would like the margin of error of the 95% confidence interval for the proportion to be 0.05 or less. Use the guessed value p = 0.25 to find the required sample size.
The National Collegiate association (NCAA) reported that the mean number of hours spent per week on coaching and recruiting by college football assistant coaches during the season 70.
A company produces and sells four grades of industrial solvents - A, B, C, and D.The selling price per gallon of each grade of solventis $6.40, $5.00, $4.20, and $3.50 respectively.
a farmer believes that the yields of his tomato plaints have a normal distribution with an average yield of 11 lbs and
Critical Thinking: Discuss the implications of: magnitude (from 0 to 1); sign ( + or -); and probability versus causality for the Correlation Coefficient (also known as the Pearson Product-Moment Correlation Coefficient).
How would you choose an appropriate level of significance for your statistical test? What are the possible outcomes and limitations or your statistical test?
To speed up the process in a blood testing procedure, blood samples from 3 people are combined into one mixture. The mixture will on test negative if all individual samples are negative. If the probability than an individual sample tests positive ..
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
in an effort to improve the vocabulary of 10 students a teacher provides a weekly 1 hour tutoring session for them. a
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