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A random sample of 15 items is taken, producing a sample mean of 2.364 with a sample variance of 0.81. Assumexis normally distributed and construct a 90% confidence interval for the population mean.
It is known that 35% of the members of a certain population suffer from one or more chronic diseases. What is the probability that in a sample of 200 subjects drawn at random from this population 80 or more will have at least one chronic disea..
write a report on simple data analysis and comparison.explain briefly how simple data analysis methods you are to use
a. If n=8 for both samples, find each of the sample variances, and calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances.
1. Calculate the sample size needed given these factors: one-tailed t-test with two independent groups of equal size small effect size (see Piasta, S.B., & Justice, L.M., 2010) alpha =.05
A large playlist consists of songs with times which have mean 2 minutes ten seconds and standard deviation 15 seconds.
Foot size correlates positively with math skills. This is because younger children have tiny feet and do not know math. Correlation does not mean causation. Sometimes we make that error. What things may correlate, but not be causal?
An auto insurance company classifies policy holder
Write out the probability distribution of x. Find the mean m , variance s2, and standard deviation s of this distribution.
What would be the hypotheses you are testing in this situation? b. Perform the test and give the correct conclusion based on your test results using α = 0.05.
Can telling yourself during exercise that youre not as tired as you think you are help you work out longer and achieve more benefit from your exercise? Researchers from the University of Kent in Canterbury, England published results in the Jour..
Research Manuscript Critique -Demographics: Explain the demographic variables (age, gender, ethnicity, education etc and how these related to the study)
Find the critical value χ 2L corresponding to a sample size of 19 and a confidence level of 90 percent.
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