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Problem: Elements of Statistics- Concept Research
Question A. Using a search engine or in the virtual library database, conduct research taking into consideration the following concepts:
a. Point estimatorb. Confidence intervalc. t-distributiond. Confidence levele. Proportion estimation
Question B. How do you determine the 95% confidence interval?
Question C. Define the sample size needed to develop a 90% confidence interval for means and proportion (add the numbers required)?
Question D. How are the values of 1.96 and 2.58 obtained in the interval estimation formula, and to what confidence levels do they relate to each other?
Question E. Explain the limitations of a point estimator.
Why does Bob continue to play the video game even after losing $300?
Let X be N(O, 1/0). Assume that the unknown O is a value of a random variable 0 which has a gamma distribution with parameters IX = r/2 and fJ = 2/r, where r is a positive integer. Show that X has a marginal I-distribution with r degrees of freed..
A study was conducted by Douglas C. West to examine under what conditions, if any, advertising agencies take more risk. The primary statistical technique
Create a stem-and-leaf plot for these ages.- Create a dotplot for these ages.- Describe the shape of this dataset.
The sales of Lexus automobiles in the Detroit area follow a Poisson distribution with a mean of 3 per day. What is the probability that for five consecutive days at least one Lexus is sold?
Test-retest reliability coefficients (Pearson Product-Moment Correlations) were calculated based on sample retesting of 50-75 students in Grades K, 1, 3, 5, 8, and 12. The resultant reliability coefficients ranged from (.42) in kindergarten for Sp..
Suppose that a statistic U has a probability density function that is positive over the interval a ≤ u ≤ b and suppose that the density depends on a parameter θ that can range over the interval α1 ≤ θ ≤ α2.
Find the sampling plan if the producer's stipulation is to be satisfied exactly. Find the average sample number for lots that are 1.8% nonconforming.
Statistics for investing (3.1) Joe's retirement plan invests in stocks through an "index fund" that follows the behavior of the stock market as a whole.
Variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
Explain how the IQRs of these two distributions can be so similar even though the standard deviations are quite different.
Calculate the sample mean and the sample standard deviation to one decimal place using a TI-83+ or TI-84 calculator.
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